I'd recommend feeding bloodworms. These fish are pretty delicate, so very clean, well-oxygenated water is important.
This species is very rare in the hobby, where did you find it?
I actually haven't kept one...but I've caught them in SA before and they usually die fairly quickly without lots of oxygen. I'd recommend at least a 40 gallon tank...and probably would advise keeping it by itself until it is well-established. Got any pictures?