Dude, watch your other fish. I had two of those, and I have never ever been happy when a fish died except for those two did. They could not possibly have had a better diet, and yet they insisted on sucking on all of my other fish. They are so cool looking, but they caused damage to so many of my fish!
Edit: Sorry for negative response, as I know how exciting it is when you get new fish. I just REALLY don't want you coming out in the morning to be shocked to find all your current kids munched on. Keep a close eye on these guys. If you do manage to get them to not bother your other fish, I'd love to know what you're doing as these little guys are so cool looking. To me they have a little bit of a Dr. Suess look with their nobby nose.