Are you looking for a cleaner or do you just want a shrimp? I happen to think you'd be better off with a neon goby. Their tiny size makes them pretty much too small to be prey if you've got a large lion or shark. OTOH, if your lion or shark is really small still a full grown cleaner shrimp is unlikely to get eaten. It's all a gamble either way.
You do know the full adult size of a banded cat shark, yeah? Have a 200 g + tank to put it in?