I'm getting a 1,200-1,500 gallon tank with 1 fire eel, 1bgk, 1 leporinus, 1 flagtail, 2 Oscars, 3 peacock bass, 2 singrays, and a black aro and was wondering if I could get a silver aro also? But I just read that you need 3 aro's or more to help with agression. Is that true? Do I need to get another one/could I fit another in there?