My experience with this fish has been that the ubwari is one NASTY mofo. I have kept and keep several types of petros(moshi, ikola, texas gold, longola,trews,tricolors and ubwari, famula nyanza) and the ubwaris, at least the ones I had were impossible to house together. Just brutal. I had 10, forget the ratio, but several males, and they were housed with moshi and ikola and they couldn't be kept in the same tank - 6 footers 150, 220. I had them in hospital tanks most of the time. That was my group and I know they aren't all the same but pretty much everyone elses experience is the same - they are difficult. I have one 7" male left (sold the others) in with 10 6-8" moshi, a large texas gold male and a smaller female. He runs at everybody and rules the tank. Nice looking fish but not nice enough for me to try again - just plain mean. like my simo diagrammas - nasty, nasty mean. But that's the world of petros - expect a lot of babysitting amd losses despite your very best efforts - they are all unpredictable and capable of serious damage in very little time.