Well...the tank is pretty bare. I have black sand subtrate, a piece of driftwood, 2 river rocks on each side of the driftwood, and a elbow PVC pipe (which the Clown Knife occupies). I hate the way the PVC pipe looks with the rest of the decor, but it makes the CK comfy. I guess I'd like to keep the decor minimal. Would it still be okay to put another Pleco in there?