Okay so im looking for a nice looking hap that has nice color and are entertaining to watch. I might be getting a 75 or 90 gallon tank and I was wondering If I could do a species tank. I am also (on a side note) looking for fish that will cost quite a bit as adults. So far I have looked at venustus and Copadichromis Azureus. Any other fish that might fall into this category? What ratios should I have?