what other type of Tang for my 150

[marie]

I've had mine for 2 years and except for the first stressful (for me) 6 weeks he has never been ill or bothered by parasites.
But my 175g bowfront is just too small for him, he uses up every available space and then some and he can swim fast. I must lose a gallon of water a day just from the water he flips out of the tank with his tail