Are these super-active? If they're what I've seen from a vendor before, they might be incredibly aggressive. I saw somebody who had cats like these that he said had actually burrowed into a larger fish and eaten it from the inside out. I think they might have been similarly priced, too.
Edit: googled and think we're talking about the same thing. From planetcatfish:
[TD="class: tablerowtitle1"]
Compatibility
[/TD]
[TD="class: tablerow1"]Not a fish to be trusted with others. Its natural adult behaviour is to bite lumps out of larger deep river channel fish such as the scaleless Pimelodids. Younger fish in the aquarium do not seem so dangerous, perhaps because they are young or well fed. It will however always eat smaller fish and is an accomplished hunter.[/TD]
[TD="class: tablerowtitle2"]
Suggested Tankmates
[/TD]
[TD="class: tablerow2"]It is believed these are a shoaling fish, but no data is available on keeping them as such in aquaria. Perhaps armoured catfish are the best bet, but ensure all fishes are well fed.[/TD]
It would be totally badass to get a bunch of these in a species tank.