i'm newbie to both kind. Can they really live together in a 180gallon tank (6x2x2) with a 60gallons sump. I have a 18" arowana, 10-11" widebar, 1 blood parrot, 1 6-8" pleco. I just ordered 1 flower ray size will be 6-8". I'm thinking to get 1 12" Tig from All Happy. So should i get the Tig too or no ?