Originally Posted by Tizzo
You didn't miss the post, but that wasn't his question. I have learned in the past that when your answer doesn't correlate with the question, that it usually ends up heated...
THey have 3 fish in a 42 gallon, and we have no idea of the sump size or even if there is one... We could target the tang, the over crowdedness, or just simply answer his original question. I went the easy route...
Fair enough... I guess I should have done the same thing.
Enoch83, there have been a lot of new posters originally, so if you haven't been welcomed to the boards yet the; Welcome!
There are many schooling fish available in the hobby. Some are compatable with your tank, some are not. As suggested, Chromis are a great choice, although they normally do best in a school of 6 or more. That would be too much for your tank. Also Anthias school, although they are not for beginners. Coral cats school when young, but they get huge, ugly and don't school. Engineer Gobies can school when younger imitating Coral Cats. Blue Reef Chromis school, but they seem to be harder to get a healthy specimen.
The biggest thing is to research your purchases. Most species of damsels are very territorial, grow quickly, and are not suitable for a peaceful reef tank. Eels can really move your rock around; make sure you have your rock secured. Tangs are not compatable for tanks less than 6 feet long; some suggest 4 feet.
The biggest thing to realize is that Marine Fish can't be crowded like freshwater fish. Your 42g tank is going to limit the number of fish you have.