As some of you may know, I have 2 cory cats, 2 black widow tetras, and 5 Japanese trapdoor snails (4 are pretty small, 1 is bigger than a golf ball) in a Fluval Spec V (5 gallon). Do 40% water changes every 5 days. I am thinking about just moving some of them into the Fluval Spec III with the Endler and not adding any other fish. Should I move some of the fish and or snails to the Spec III or are they going to all be stunted. The Fluval Spec V has black Petco sand as substrate. It also has an Anubias plant, Amazing Amazon Frogbit, and a piece of driftwood. The Fluval Spec III has smooth river rock gravel for a substrate and an Anubias plant and a Hygrophilia Corymbosa Stricta plant.