I currently have a 20 gallon aquarium with 2 ghost shrimp, a lyre tail molly, 2 african dwarf frogs and a bushy nosed pleco. The petsmart associate said that the ghost shrimp, frogs and pleco don't count in terms of filling my tank. That doesn't sound right, but is that true? In that case I'd like to get more fish because my molly looks lonely.
Also what do you suggest I add to my aquarium?
Are my water levels okay? I read nitrates under 20 ppm