the problem is I want the peacock, (to early to think of latin name) .... and I think they do pose a threat, I mean theres NO WAY that the thing is going to hurt anyone.... it will be covered, and who would just randomly put thier hand in there, Maybie ill put a little sign up.... I dunno... what other nice looking species would do good in a 20 gallon.... any that get around 4-5 inches??