I had a nice Sailfin in a standard 90 and I never saw any signs of the tank being to small for it. I wouldn't put a school of tangs in a 4 foot but I'd keep another sailfin. My current tank (setting up) is a 54 gallon corner and I know I won't be putting a tang in there I'm aiming at a pair of saddlebacks, maybe a goby/pistol shrimp and something else small. The rest of the tank inhabitants will be snails, shrimp and corals.
Doug
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