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• 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

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