A male only comm works, given space. Find some assured males, Midas, jags and Butii and try it.
Male tubes will be pointed and poiting outward. Female tube are rounder and more fan shaped and nuchal hump can be depending in the fathers hump. Regardless of any hump size they will show at 6" normally.
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Humps are also related to dominance and breeding. Are there competitive males? Any females?
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very nice, i would keep a close eye on it ,i've had them before that seem very placid and look like they are going to get along with tanks mates and once they have been in the tank a few days there aggression starts to build.