i have a purple sailfin tang in my 90 gallon for about 2 months now i was wondering if he would fight with a kole tang that i have in my with 50 i wanted to put him in the 90 so that he would have more swimming room.
The Kole and the sailfin tang should get along but I think by you having just the 90 gallons that the sailfin will need a bigger tank. With most sailfin you should have at least a 135 gal. they can grow to about 14-15"
