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• Hymenochirus boettgeri
  :Some people keep DAFs with [[Betta splendens]]. This is difficult, as Bettas are also [[carnivore]]s, so they compete for the same types of f ...orm]]s are often suggested to owners as a DAFs main food source. This is a very bad idea for a DAF, as this food source is low in protein, and lacks many e
  17 KB (2,752 words) - 20:42, 14 February 2024
• GloFish
  ...ales also have a brighter gold tone to their metallic stripes, but this is difficult to discern without direct comparison to male fish. .../glofish.com/license.html Glofish Official Licence]</ref> It is made more difficult by hyperbaric treatment of the young to render them sterile.
  6 KB (983 words) - 12:15, 8 June 2020
• Pterophyllum scalare
  :Extremely difficult. Look for a slight [[nuchal hump]] on mature males, although it's not alway ..., this can be largely prevented by adding small fish when the Angelfish is very young. It then doesn't regard these fish as food. It also appears to lessen
  9 KB (1,385 words) - 09:54, 12 January 2020
• The Salt of the Earth
  ...m arose historically because water with higher levels of Ca and Mg is more difficult to use for washing clothes – it is harder to produce lather from soap (or ...ly hard to hard, and alkaline, is going to be improved by increasing those very things in which our water differs most from the natural waters of these fis
  13 KB (2,290 words) - 05:09, 14 February 2011
• Caridina multidentata
  ...as well as special feeding. Breeding of this species is considered fairly difficult as the zoeas need to be gradually introduced to salt water and then back to
  9 KB (1,370 words) - 15:27, 11 November 2023
• Zebrasoma flavescens
  :It is difficult to visually sex this fish.
  2 KB (347 words) - 01:58, 13 December 2017
• Fish Profile
  ...er(JAW)/Very Easy(VE)/Easy(E)/Moderate(M)/Challenging(C)/Difficult(D)/Very Difficult(VD) |availability = Very Common(VC)/Common(C)/Uncommon(U)/Rare(R)
  2 KB (296 words) - 13:04, 8 August 2011
• Plant Profile
  :How difficult is the care of this plant? (easy/moderate/hard/very hard) |difficulty = Easy/moderate/hard/very hard
  3 KB (461 words) - 04:28, 14 February 2011
• Pomacea bridgesii
  :Difficult, these are NOT hermaphroditic snails. Female grows faster than the male at
  5 KB (828 words) - 11:22, 9 January 2021
• Coral Profile
  :How difficult is it to keep this animal (Easy/moderate/hard/very hard) |difficulty = Easy/Moderate/Hard/Very Hard
  2 KB (301 words) - 02:11, 14 February 2011
• Gymnocorymbus ternetzi
  ...ank should be mature and well filtered but without too much current. Avoid very bright lights. ...tly translucent. Long-fin varieties of both colours have been bred but are difficult to keep as they will fin-nip amongst themselves.
  7 KB (1,023 words) - 16:57, 20 November 2023
• Beaufortia kweichowensis
  :Very difficult to sex, during breeding it is possible that males have more vivid colourati ...om river tank article] before considering this fish (See link below). Has very slow growth rate in captivity.
  4 KB (602 words) - 02:08, 26 October 2023
• Otocinclus macrospilus
  :Difficult. Females are slightly bigger than males. :Ensure that you look at their bellies carefully in the shop and if they look very thin or hollow bellied then tell the shop to feed them more [[algae tablets
  4 KB (634 words) - 09:35, 11 July 2021
• Pogostemon stellatus
  |difficulty = difficult
  899 bytes (96 words) - 16:21, 7 June 2020
• Breeding Mikrogeophagus ramirezi
  There is the traditional food recommended [[infusoria]], but this is "difficult" to produce and with the uncertain concentration. ...e placed into a small container. A few drops of water is then added. The very small utensils can then be used to make a mash. Once it is smooth, then ad
  4 KB (729 words) - 12:54, 14 February 2018
• Osteoglossum bicirrhosum
  :Very difficult to sex visually. Mature females are generally more rounded in the body and ...incubate them. Fry will live out of the fathers mouth for the beginning, very similar to what is found in mouthbrooding cichlids. Fry are generally cons
  7 KB (1,093 words) - 00:05, 26 October 2023
• Yasuhikotakia sidthimunki
  :Mature females will be broader in the mid-section and longer, otherwise difficult to sex. An egg scatterer, but breeding is unknown in captivity. Though arti :A generally peaceful community fish but it's very high activity levels may bother more docile or shy fish, especially those t
  3 KB (540 words) - 02:22, 13 December 2017
• Carassius auratus
  ...ood tankmates for Goldfish as Plecos are not only tropical fish but have a difficult time getting enough to eat and, given they are nocturnal, they may also lat ...t older. Constipation is a real concern with these type of goldfish. So be very careful that you don't over feed this fish. Never give it more than it can
  14 KB (2,151 words) - 22:43, 16 January 2021
• Freshwater algae
  ...ant leaves as well as on the edges of almost any hard surface. Composed of very fine strands it grows in dense patches resembling a dirty green beard, thus :Appearance: Actually bacteria ([[cyanobacteria]]). Grows very rapidly in blue-green, slimy goo-like sheets. This algae spreads over virtu
  10 KB (1,740 words) - 23:31, 6 February 2012
• Kryptopterus bicirrhis
  :These fish are difficult to sex, however, females are a little plumper when mature. :Passive and can be shy and very accepting of their own species. This is a tight schooling fish and needs th
  3 KB (398 words) - 02:23, 13 December 2017
• Fungus
  ...'herbal' or [[w:Tea tree oil|tea-tree oil]] remedies as these are at best very weak in action. There is another disease which looks very similar to 'Cotton Mouth disease and this is actually a serious bacteria in
  6 KB (940 words) - 22:22, 27 November 2013
• Constipation
  ...on of the digestive system where an animal experiences hard feces that are difficult to eliminate; it may be extremely painful, and in severe cases lead to symp ...o suffer from this as in the wild they feed mainly on insects and so it is difficult to feed them the correct amnount of fibre in their diet.
  1 KB (197 words) - 05:04, 24 February 2011
• Caridina gracilirostris
  ...as well as special feeding. Breeding of this species is considered fairly difficult.
  3 KB (465 words) - 18:20, 2 September 2020
• Synchiropus splendidus
  :Their diet can be their downfall in captivity, they're known to be very fussy eaters, primarily feeding on copepods and amphipods. Some may take fr ...duals starve in captivity. This is the main reason why it is rated as very difficult. While commonly found in LFS's, and not particularly expensive, most indivi
  6 KB (876 words) - 18:48, 17 June 2020
• Sphaerichthys vaillanti
  |difficulty=Difficult
  3 KB (462 words) - 17:02, 13 November 2019
• Virual diseases
  ...achinery of a host cell to reproduce and also reside within them, they are difficult to eliminate without killing the host cell. This is why it is very rare for chemical treatments to be used to treat viruses as to kill the vir
  3 KB (411 words) - 19:56, 23 October 2011
• Velvet
  ...und scratching at things in the tank very rapidly and usually has its fins very close to its body. Seeing Velvet on a fish is very difficult. One tip is to darken the room and tank lights. Shine a flashlight or torch
  3 KB (543 words) - 06:54, 24 February 2011
• Gymnarchus niloticus
  |difficulty=Very Difficult :Impossible to sex, and only able to breed in very large aquaria of at least {{gal|1000}}. They are mouthbrooders, the male ca
  3 KB (403 words) - 21:01, 26 May 2021
• Barbus ablabes
  :Difficult to visually sex, mature females may be slightly plumper in the belly than m
  2 KB (321 words) - 02:23, 13 December 2017
• Steatocranus casuarius
  :Members of this genus are difficult to confuse with any other cichlids. The buffalo head cichlids are robust, e
  3 KB (512 words) - 02:23, 13 December 2017
• Alestes humilis
  :Difficult to sex, females may appear fuller in the belly than males.
  2 KB (245 words) - 02:23, 13 December 2017
• Pareutropius buffei
  ...of the tank. A long tank is best for this fish and they do not appreciate very bright lighting so floating plants are desirable. ...d caudal fin which can be mistaken for ''[[Pareutropius debauwi]]'', it is difficult to tell these fish apart when juvenile. It has three bold lateral body stri
  2 KB (368 words) - 01:15, 19 February 2020
• Xenomystus nigri
  :These fish are difficult to visually sex. It's said that females have more colour when in spawning c
  2 KB (362 words) - 02:23, 13 December 2017
• Hepsetus odoe
  :It is difficult to get this fish to accept anything other than live food and care should be ...wim past, when it will zip out with lightening speed and grab the prey, it very rarely misses its target!
  3 KB (391 words) - 02:23, 13 December 2017
• Hydrocynus goliath
  :Difficult to sex, females may be broader in the belly than males. :Due to its large size and predatory nature, this fish is best kept in a very large species tank, can be kept with its own kind if introduced to the envi
  2 KB (358 words) - 02:23, 13 December 2017
• Epalzeorhynchos bicolor
  :A difficult fish to visually sex. Females are usually larger. Females have a grey stoma
  4 KB (592 words) - 12:17, 9 June 2020
• Atractosteus spatula
  : It is difficult to visually sex Alligator Gars. ...these remarkably alligator-like teeth which gives it its name. They have a very long body with a pointed snout, their fins are rounded and paddle-like.
  5 KB (719 words) - 05:21, 10 July 2021
• Pterophyllum altum
  :Extremely difficult. Look for a slight Cichlid hump on the male, although it's not always accur :Although the Altum isn't a long fish it is very tall with dramatically elongate fins, in fact the Altum can be twice as tal
  3 KB (510 words) - 07:23, 10 January 2020
• Synodontis angelicus
  :Difficult without observing the underside of the fish out of the water. Males tend to
  3 KB (455 words) - 19:48, 26 September 2018
• Toxotes jaculatrix
  :Difficult to visually sex.
  2 KB (305 words) - 23:15, 13 February 2018
• Scleropages formosus
  ...e females tend to be plumper than males. Are bred in captivity but only in very large ponds and in controlled conditions. ...mportant than depth, the Arowana must have room to turn around as it's not very flexible! A secure lid is a must as the Arowana is purely top-dwelling and
  3 KB (493 words) - 02:24, 13 December 2017
• Periophthalmus barbarus
  :Needs very specific environmental conditions. A raised area of land (sandy beach, pile ...e correct environment is provided, this should be a regular occurrence. Is very territorial towards it's own species and other creatures entering it's surr
  2 KB (325 words) - 22:24, 13 February 2018
• Neoceratodus forsteri
  :It is very difficult to visually sex these fish. :These are very large unpredictable fish best kept alone in a species tank. They are capabl
  3 KB (476 words) - 02:24, 13 December 2017
• Microctenopoma fasciolatum
  ...gle female and will most likely require culling unless the rearing tank is very large. ...ghly uncommon species that is not consistently available. Not particularly difficult to keep or breed if it can be acquired, though.
  4 KB (652 words) - 14:33, 28 November 2020
• Creagrutus beni
  :Difficult to sex, females may appear fuller in the belly than males.
  2 KB (284 words) - 02:42, 13 December 2017
• Brycinus macrolepidotus
  :Difficult to sex, colours on males may be more vibrant than females.
  2 KB (344 words) - 02:42, 13 December 2017
• Ictalurus melas
  :Difficult to sex. Females are broader during spawning season which is mid-spring. ...y catfish, has spines on it's fins that can inflict a painful sting, so be very wary putting your hands near this fish. The pectoral spines, however, can
  3 KB (428 words) - 02:43, 13 December 2017
• Potamotrygon leopoldi
  ...ze. The tank should be very well filtered and mature. Any décor should be very secure to avoid being toppled, and should not get in the way of the Ray. ...of Ray has been banned from export from their native Brazil, they're also difficult to breed in captivity. The price of these to buy is extortionately high and
  3 KB (436 words) - 02:43, 13 December 2017
• Paracyprichromis nigripinnis
  :Difficult when young, mature males are more intensely coloured. ...imum aquarium. Like most Tanganyikan cichlids, do not take excess nitrates very well, so tanks should have two 25% water changes weekly: they also do not l
  3 KB (375 words) - 18:36, 21 December 2023
• Labeo chrysophekadion
  :Difficult to visually determine the sex. There are no records of this fish being bred :Needs a very large and spacious tank with some hiding places and room to roam without ge
  3 KB (442 words) - 00:08, 12 January 2021
• Carnegiella marthae
  ...entifiable during spawning when eggs can be seen in the females body. Very difficult to breed in captivity, most specimens found will be wild caught. :A very distinctive looking fish. A convex body with "wing" like pectoral fins. The
  2 KB (294 words) - 02:43, 13 December 2017
• Aphyocharax anisitsi
  :Difficult to sex, females may appear fully in the belly.
  2 KB (278 words) - 02:43, 13 December 2017
• Cyrtocara moorii
  ...umphead' common name. Both males and females have nuchal hump so sexing is difficult. Keep at a young age with one male to three females and they will eventuall
  3 KB (483 words) - 02:43, 13 December 2017
• Hyphessobrycon peruvianus
  :Difficult to sex, females may appear fuller in the belly.
  2 KB (284 words) - 02:44, 13 December 2017
• Tropheus moorii
  |difficulty=Difficult :Monomorphic fish that are difficult to sex unless the female is holding (they are maternal mouthbrooders). Howe
  5 KB (772 words) - 02:44, 13 December 2017
• Butis butis
  :It is difficult to visually sex this fish.
  2 KB (334 words) - 12:02, 8 June 2020
• Apistogramma borellii
  ...han many of its congeners, is relatively peaceful, and is not particularly difficult to spawn. However, they still require good water quality.
  4 KB (595 words) - 17:14, 14 November 2019
• Tropheus brichardi
  :These fish are very difficult to sex with no differences colour or size wise. If you are able to see the
  2 KB (327 words) - 02:44, 13 December 2017
• Synodontis brichardi
  :Difficult to sex visually and there are no known reports of this fish being bred in c
  2 KB (314 words) - 02:44, 13 December 2017
• Pseudosphromenus dayi
  :Difficult to sex visually, males have more pointed and elongated dorsal, anal and cau
  2 KB (290 words) - 02:44, 13 December 2017
• Salmo trutta
  :This fish can be very territorial towards other trout, especially males of its own species. This :A large gamefish that is difficult to keep in captivity, best left to private lakes/rivers and the wild. Juven
  4 KB (585 words) - 02:44, 13 December 2017
• Notesthes robusta
  :It's very difficult to visually sex this fish.
  3 KB (370 words) - 02:45, 13 December 2017
• Brachygobius xanthozonus
  :Very difficult to sex visually and challenging to breed in captivity.
  3 KB (411 words) - 02:45, 13 December 2017
• Selenotoca multifasciata
  :These fish are very difficult to visually sex with no obvious external differences. :Keep in brackish water; as very young fish they can be kept in hard, alkaline freshwater, but as they grow
  2 KB (351 words) - 02:45, 13 December 2017
• Calophysus macropterus
  :Difficult to sex visually. The males are usually somewhat slimmer then the females. N
  3 KB (372 words) - 02:45, 13 December 2017
• Sphaerichthys osphromenoides
  ...h. Males have a straight throatline, which is rounded in females. They are difficult to breed in captivity.
  3 KB (408 words) - 02:45, 13 December 2017
• Leptobarbus hoevenii
  :This fish is difficult to sex visually and is not known to breed in captivity.
  2 KB (260 words) - 02:45, 13 December 2017
• Rhinodoras dorbignyi
  :It's very difficult to visually sex this fish. ...h or fry. Keep with similar sized peaceful fish, do not keep with anything very active nor with anything that may nip or bully this catfish. Will co-habit
  2 KB (366 words) - 02:46, 13 December 2017
• Chitala chitala
  :It is difficult to visually sex this fish. However, they have been bred in captivity, but m ...pt with smaller fish, can only be kept with similar sized robust fish in a very large tank. It can only be kept with other Clown Knife's in groups of 3 or
  3 KB (470 words) - 02:46, 13 December 2017
• Betta coccina
  ...grow, because of this the water is tea-coloured and the pH of the water is very low. These ponds are also cooler in temperature than what you'd find wild ' :Can be kept in male/female groups. They're difficult to breed as they pair up, if they don't like their partner, nothing will ha
  2 KB (363 words) - 02:46, 13 December 2017
• Altolamprologus compressiceps
  :Difficult, but mature males tend to be considerably larger than females when mature a ...means that they can also be kept in many other rift lake setups, although very aggressive fish should be avoided. However, they are extremely skilled fry
  5 KB (841 words) - 17:01, 21 December 2023
• Barbus eutaenia
  :Difficult to visually sex, mature females may be fuller in the belly.
  2 KB (336 words) - 02:47, 13 December 2017
• Pimelodus blochii
  :Difficult to sex.
  1 KB (149 words) - 02:47, 13 December 2017
• Trichopsis pumila
  :It is difficult to sex these fish visually. Mature females may be slightly fuller in the be
  2 KB (305 words) - 02:47, 13 December 2017
• Heterandria formosa
  |difficulty=Very easy ...nge spot on their dorsal fin. Their small size and coloring make them very difficult to confuse with any other livebearer, and the presence of a gonopodium in m
  4 KB (719 words) - 22:25, 14 November 2019
• Nannostomus marginatus
  ...immer and may show more red in their fins than the females. These fish are difficult to breed in captivity. ...ank with good filtration, but not a strong current. They do not appreciate very bright lighting so floating plants are desirable.
  2 KB (350 words) - 02:47, 13 December 2017
• Lefua costata
  :Difficult to sex visually. :A very elongated fish with a bold black lateral line from nose to caudal fin on a
  2 KB (256 words) - 02:47, 13 December 2017
• Hypseleotris compressa
  :Again, not a difficult species to accommodate assuming the tank is large enough. This species is t ...ually everything else about this species, reproducing these fishes is very difficult; while they spawn readily enough, the eggs are extremely small - about 320
  3 KB (510 words) - 18:16, 14 November 2019
• Myxocyprinus asiaticus
  :Difficult to sex and not known to spawn in captivity due to them rarely reaching matu :A temperate fish rather than tropical, this fish requires very large housing due to it's final adult size, combined with a good current an
  3 KB (471 words) - 02:47, 13 December 2017
• Protopterus aethiopicus aethiopicus
  :Difficult to visually sex. ...d in the wild during dry season. This is a very large fish that requires a very large tank with ample room to turn around. A soft substrate is ideal with [
  2 KB (381 words) - 02:47, 13 December 2017
• Elassoma evergladei
  ...nd courting females with a distinctive 'dance'; subdominant males are very difficult to distinguish from subadult females, though adult females are far plumper ...housed with anything larger than themselves. Best kept in a species tank; very small fish like least killifish can be mixed with pygmy sunfish, but neithe
  4 KB (704 words) - 23:39, 22 November 2019
• Neolamprologus brichardi
  :Difficult to visually sex. Dorsal and anal fins appear slightly longer on males. Male :This fish looks very un-Cichlid like and quite stunning. It has a pale base colour with a black
  2 KB (321 words) - 02:48, 13 December 2017
• Mesonauta festivus
  :These fish are quite difficult to visually sex. The pectoral and anal fins of mature males will be slightl
  3 KB (478 words) - 02:48, 13 December 2017
• Dichotomyctere ocellatus
  :Very difficult to sex visually. :These are very messy fish so their tank should be mature, well filtered and spacious.
  3 KB (425 words) - 18:42, 16 December 2017
• Mastacembelus erythrotaenia
  :Mature females are plumper than males, quite difficult to sex however.
  2 KB (346 words) - 02:13, 26 October 2023
• Neritina natalensis sp
  ...ults can call brackish, and marine setups home. The eggs harden and can be difficult to remove.
  4 KB (528 words) - 11:27, 9 January 2021
• Neolamprologus furcifer
  :Males have more vibrant colouration. Difficult to breed in captivity. ...e male per tank, unless the tank is very large. They do pair bond, but not very strongly.
  2 KB (309 words) - 02:48, 13 December 2017
• I got a Goldfish from a fair...
  ..., giving animals away as prizes would be outlawed BUT this is still a very very common occurance. ...ncocted. Keeping your Goldfish in a small unfiltered bowl will lead to its very early death and there is no way to keep them healthy in such a container.
  4 KB (665 words) - 15:56, 30 August 2013
• Ctenolucius hujeta
  :A carnivorous fish that may prove difficult to wean onto dead food. Does well on meaty foods such as earthworms and cri
  3 KB (445 words) - 02:48, 13 December 2017
• Echidna rhodochilus
  :Can be a difficult fish to feed. May only take live food such as shrimp and snails. Can be slo :Typical Moray in shape with a very elongate slender snake-like body with a large mouth. The body is brown/blac
  3 KB (434 words) - 02:48, 13 December 2017
• Hiodon alosoides
  |difficulty=Difficult
  950 bytes (126 words) - 03:33, 13 December 2017
• Nannostomus nitidus
  :Difficult to sex, mature females may appear more plump. ...ensely planted tank with some open swimming space. This fish does not like very bright light.
  2 KB (264 words) - 02:49, 13 December 2017
• Brachyplatystoma filamentosum
  :Difficult to visually sex. :A very large fish that should either be kept with similar sized fish (which, once
  2 KB (378 words) - 02:49, 13 December 2017
• Sinibotia robusta
  :Difficult to sex, and breeding is not known in captivity. Mature females may have a t
  2 KB (326 words) - 02:49, 13 December 2017
• Aequidens rivulatus
  ...and caring parents. They form a bond at a young age, mature fish are more difficult to bond. :A very attractive fish, with yellow/orange edging to the fins. It is an oval-shape
  4 KB (523 words) - 02:38, 26 October 2023
• Ageneiosus inermis
  ...on top. The mouth is large, wide, and has extremely short barbels that are difficult to find.
  1 KB (193 words) - 02:50, 13 December 2017
• Hampala macrolepidota
  :Sexing this fish is difficult. Mature females will appear fuller in the belly area.
  2 KB (290 words) - 02:50, 13 December 2017
• Abramites hypselonotus
  :These fish are difficult to sex visually, mature females may appear plumper. ...ally spacious well filtered tank with a secure lid. They do not appreciate very bright lights and need [[bogwood]] and rock hiding places.
  3 KB (401 words) - 02:50, 13 December 2017
• Chelmon mulleri
  :Can be difficult to feed. Should be offered a variety of foods including [[mysis shrimp]], v
  2 KB (251 words) - 03:41, 13 December 2017
• Lepidocephalus thermalis
  :It is difficult to visually sex this fish, although mature females may appear plumper than ...eaceful Loach that does best in large groups, at least 3 or more. They are very active and should not be kept with shy or territorial fish.
  2 KB (291 words) - 02:57, 13 December 2017

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