I have a 40 gallon aquarium containing 2 tank raised percula clownfish, a cleaner shrimp, and 4 blue/green chromises, I have been looking at different types of cardinalfish, I think they are neat and would like to get some, either pajama or baganni (sorry if I didn't spell it right). How big do they get? How many should I have in my tank? And will the fish I currently have be okay with them? Also I would like to know some general tips on how to care for them. Help is appreciated.