Hi guys. I bought a 55 gallon today and am already planning it all out, and I am considering stocking at the moment. I really love the looks of yellow labs, and I think I may do a species tank with them. Now for my questions: 1. how many should I get? 2. How to sex them? I really do want an African cichlid tank, so are there any other reasonably priced options that would be good in a 55? Thanks!