I'm looking for a madtom to join two longear sunfish and a warmouth in a 65g tank. We have tadpole madtoms and freckled madtoms in the area, but they're too small- they'll be eaten. The warmouth is about 4" right now, so there's time for a new arrival to grow, but it needs to get fairly large.
Does anyone have a slightly larger species of madtom for sale or know where I can get one? I'm not picky about species, just something large enough that a full-sized warmouth won't be able to eat it and won't try to eat it. A stonecat could work.