I've got a 120g aquarium with SA fish, and I'd really like a pleco to go with my stock. My filtration is an aqueon 55 and an aquaclear 110, I'll be getting a large canister come christmas. My current stock is one pleco (common), two geophagus tapajos, one blue acara, one green severum, and some pictus catfish. My primary concern is that either the tank is too small or that the oscar will eat the pictus.The footprint is 5'x18". I'd like to get SDs eventually, but they are optional. Any advice is appreciated.