Here's my experince- I've had one for about half a year now with a sailfin, blue hippo and was with a yellow eye kole tang(lost it to velvet). He is best friends with the sailfin. Follows it around everywhere. They occasionally will spar but it is quickly over. The sailfin is slightly larger but again he won't leave the sailfins side. They were together in my 65 gallon but as they grew I have gotten the 180. Right now though they are in a qt with most my other fish. I would say if you plan on getting smaller less agressive tangs to by them first. Anyways good luck, hope it works out for you.