I have a 20 gallon, 30, and 60 gallon full of fish that I'm combining into one tank that has been cycling tomorrow. I was wondering if I could add any more fish or if this is the end of stocking for me... I have 2 oscars (5 inches), a jack Dempsey (3 inches), a earth eater (3 inches), a pair of convicts (3/4-1 inch each), and 3 pictus catfish (3-4 inches). what else could I put in there (if I can) maybe like 10-20 tiger barbs or something?