You will get mixed reviews from different reefers, I have kept a yellow tang in my 33G it was about 2 inches, what i did is I kept a yellow in my tank with the thought that when it outgrows my tank I will upgrage, and I did upgraded to a 3 foot, 65G...I think you are ok to keep a tang as long as it is small and the bio load can be taken care of with good filtration and flow...
Kris
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