black widow tetras can get to be a decent size (for a tetra) in a huuuuge tank. get a whole bunch more of them for sure.
you cannot get any sizeable preds in there with them unless you dont mind replacing them frequently.
you could try a ctenopoma maybe? something predatory that is under 4 inches and cannot eat them whole.
but, they will bully them and your tetras will live a life of terror, and you will still have to replace them, just not as frequently.
you cannot get any sizeable preds in there with them unless you dont mind replacing them frequently.
you could try a ctenopoma maybe? something predatory that is under 4 inches and cannot eat them whole.
but, they will bully them and your tetras will live a life of terror, and you will still have to replace them, just not as frequently.




