I'm considering setting up a 75 gallon demasoni pombo rocks/Labidochromis Caeruleus Lions Cove tank, and of course have some questions. First, are there any good possibilities for a third tank mate species? Don't need one really, just curious. I've seen a tank like that with a light blue species, don't know what the actual species was, or if it would be a good idea, but it looked good. I've been thinking about maybe 18-24 juvenile demasoni, and 6-8 yellow labs. Would that be a good number to start with? If I did add a third species what would/should that do the the stocking levels of the demasoni and labs? And finally, I already have a 3" yellow lab, would introduction other 1.75 - 2" yellow labs at the same time be problematic?