The question of size of tank and fish related is an ongoing debate. It is safe to say, what each person considers appropriate, varies incredibly. It comes down to the fact if the fish can reasonably survive and have adequate room to move around.... people on this forum and others have had certain tangs in all different sizes of tanks incl. 90G. However most tangs "should" be kept in a larger tank to facilitate proper swim/exercise area as well as their growth......
Dan
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