lol. I have firemouths and one convict together in a 40 gallon (breeder) and they are fine. There are a bunch of firemouths and only one convict (I am waiting for a pair of firemouths to pair off, and I dont want little convict babies therefore I am keeping one.) A little overstocked now, but when I get rid of the unpaired firemouths it will be fine. Anyway, the convict beat the crap outa one of the firemouths, but then the firemouths and tiger barbs kinda grouped together and let the convict have it, now he pretty much sticks to himself and doesnt bother them