Ive got a new 5x2x2 hich is up and running. It is going to house some big metynnis and myleus (dollars) all about 8"+. Im not sure whether i should add my 7" Silver arowana but i don't think that hed get all the food and while hes ok in his4x2x2 i don't think that i should move him instead, i thinking og adding either my 8" RTGG or 5" GG. Which would be best?