Hi! I have a question about my friends fish tank. He bought a Marineland LED Light with a Biowheel filter(not sure of dimensions) 20 gallon tank. He wants to know if the stock he has in it right now is overstocking, so I'm asking the question for him. In the tank he has 1 Spotted Ctenopoma, about 1 1/2", and a full grown male electric blue ram(3"). The pH and water hardness are correct(soft and acidic) as well as the temperature(80-81 degrees) I think. Ammonia and Nitrates are(Ammonia at 0) low too. The Ram and Ctenopoma get along fairly peacefully, with each having it's own side of the tank. So, is this overstocking? I'm really not sure.