I have 6 longear sunfish and a few shiners in a 65g tank, getting along pretty well. One is about 4", the others are slightly under 3". The big guy defends his new nest but is otherwise a coward. The smaller ones occasionally chase each other, but the chases go for about 6" and then the chaser loses interest/initiative. All in all, they seem to be getting along well, especially considering that they're Leopomis.
Can I put a 3" warmouth with them and have the arrangement work long-term? I know warmouths can reach 10", but that doesn't seem likely in an aquarium that's not massive. I know I've never caught or seen a wild sunfish that's full size.
So- 65g, six longears, one warmouth, lots of duckweed, and a few blacktail shiners (maybe, might rehome if anyone wants them). Yes or no?