I have a 60 gallon tank 30 length, 21 height and 12 width. I have 1 Columbian baby shark, 1 parron shark, 1 tiger barb, 1 albino cory, 3 molly, 1 goldfish, 2 ghost fish, 1 pleco, 2 algae eaters, 1 fighting fish and 2 Angel fish did I over do it. They look happy. I had 1 green spotted puffer fish but it died I don't know why it seem happy and healthy before.All I feed my fish is flakes and algae wafers. I have 2 weeks with my tank first time fish buyer and fish care taker.