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Well, if you end up with two pairs spawning you could always put in a rock. They usually do well with convicts
In a 90G, I have four convicts and they have just mated again. It's not too bad, if you have a lot of structure for everyone to make their own territories. So long as the other fish you introduce are, at the minimum, the same size as the convicts. Some others that would play well would be: salvini, texas, firemouth, jewels, jack dempsy, plecos.
I wouldn't get too many more fish as those convicts are going to breed like crazy. The fry would make good food for the salvinis and others, but you'll need to net them away from mom and dad. Cons are psychotically overprotective of their young.