Yeah, ive got 3 convicts, a breeding pair of pink female and black male, and a lone black female, in another tank. These fish were great at first, lived in my community tank, (the female black still does) with no probs, and imo are quite peaceful fish, but that all changed when the two paired up. Not really aggressive, but took over half of my 4ft tank. Even my 3 sevs were scared off. These are great fish to watch breed, some of the best parents ive seen, mine still look after there fry after 4 months, but its near impossible to get rid of the fry, so, if any one wants a pair of convicts lol, let me know. Im dismantling their tank. The yellow one i have seen in the tank pics is identical to one i have, but am having trouble identifying. I got it off a cousin of mine who was seling up, but it is extremely peaceful and timid. It shares a 30" tank with a violet goby, 3 tiger barbs, a tiny sucking loach and an unusual firemouth.