Hi everyone, I was wondering if anyone had any ideas or suggestions on a small predator fish? I need a small/smallish predator fish that could help with clean up duty and keep live foods like minnows or guppies from seeking safety in the top section of the aquarium. An Oscar or arrowana grow way too big for my setup. I have four rays in this grow out tank, with an average disc size of about 3 inches. Any ideas aould be appreciated.