http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=help_#1 i just got a 4 or 5 in. oscar not sure what mix it is he is all green no orange except on the little ring on it back fin anyone no? and i introduced it with my 12in. oscar today n the bigger one went crazy attacking it i femoved quickly is there any way they could every be tank mates? sk843326 2010-10-05 http://forum.aqua-fish.net/?topic=help_#2 you are best adding Oscars of a similar size, the 12 inch Oscar has claimed the tank as his own, have you tried removing him for a couple of weeks and adding the smaller one, then replace the larger one so that neither fish have claimed their own territory. mickey 2010-10-11