The best one i can think of off the top of my head would a giraffe catfish. I currently have one and he is awesome i read somewhere one of them is like having 180 corey cats. The only drawback is they get huge over 30" i think and pretty fast. And would expensive to get one big enough for what you need. Its just hard to find managable sized cats that can go with a fish with a temperment like his. My jag and both dovii I have will not allow me to even try tankmates. Big pleco and lots.of places for him to hide may be your only chance for now. You will have better luck if you upgrade though extra room sometimes will change temper a little. Then you could add them to then new tank at the same time.
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