I have a 40 gallon breeder with 11 yellow labs in it. All of them are about a year old. To contrast the yellow, I wanted to add a single mbuna of a different color. Can anyone throw me some suggestions on what could work?? I'm not looking for chaos so if it's not a good idea I'd like to hear that too. I can take the hard news and am perfectly fine keeping my tank as is. Thanks all.