well, i personally would have kept the hystrix and panaque, think is, yours is pretty much fully grown at 9", and so will get very territorial to bottom feeders and nocturnal fish. Best thing to keep with them is fish around the same size that won't attack the pleco. your gunna be hard pushed to find a bottom fish that will go with it. planetcatfish recommends that barbs do very well with these fish, but i dont like the little fin nippers. could try gouramis or somethin along those lines, its up to you. what size tank is it in now?