Hi i hv a tank with angelfish,a catfish and a tetra. Recently i added few guppies into the tank but the angelfish keep on chaisng after the guppies and i hv no choice but to quarantine the guppies into another plastic container. So is there any way that can be done in order for my guppies can join them in the tank, and i wonder if angelfish is an agressive fish? Thx for reply..