I have a 265g with a 6" female Trimac and the rest are all males including 10" Festae, 9" Black Belt, 10" Melanurus, 7" Dovii, 5" Grammode, 8" Argentea, 8.5" Red Devil, 8" Midas, 7.5" Xilo, 10" Red Isletas, 9" Red Tiger Mota, 8" Bocourti, 10" Green Terror, 9" TSN catfish and a 12.5" Granulosus catfish. Most of these guys have been together for a year and I have almost zero aggression issues. Every once in a while I'll get some chasing and what not, but never much and nothing to be concerned about. It works for me, but you never know... luck plays it's part, ya know?? Good luck.