Based on the advice in the video it sounds like you may want to swap names on those fish. Small and round - female, long and thin - male. Plus the male is chasing the female.Tazmanian said:Hey guys! I just got two of these fish and am trying to figure out the genders of my fish. The smaller, rounder one (we have been calling Gus) is shy, and runs. Gus hangs out near the filter and under the palm trees where "he" can't be seen. The longer, thinner one (we have been calling Annie) is bossy and always chasing Gus around and hanging out in the open. Gus has a lighter coloration since being in the tank (for about a week now) and Annie has gotten brighter. They both seem to be eating fine, but I'm a little worried about Gus. Any information on this breed would be helpful!