My favorite currently is my female paradise fish, Pearl, who is (barely) the largest fish in her 29 gallon. I did have a male until yesterday, but had to destroy him since he forced Pearl into constant hiding and, when the lights went out, he tried to eat the danios...which is odd, since they did not appear to fit in his mouth. May try finding a less irritable male - the male before him (named Bear) was a model community resident, and this one I just destroyed (named Cape) seems to have been an unusually psychotic specimen anyway (he gave ME the death look). Anyhow, I think if I go that route, I will also get more females...Cape didn't really bother anyone before Pearl went into hiding.