Hi there, I have a 75 gallon setup, fully cycled, with 2 blue gourami, 2 opaline gourami, 2 gold gourami, 4 bala sharks, 1 pink gourami, and a pesky tiger barb I could not get out of the tank. They have all been living together without incident fro 6 months. I want to add some more color to...