If you are going to do a school of tangs I wouldn't do it in a less then a six foot long tank. I think two smaller tangs in a four foot tank can be fine as long as the tank's not over stocked. I had 5 tangs in my 120g and they were not happy. Upgraded to a 230g and they seemed much happier, until I started adding more fish. Now that my 230g is over stocked I ended up buying another 230g so that in the near future (once it's set up) I can split up the fish I have now and hopefully with less fish in the tanks, the fish I have will be happier.
I have seen a school of sailfin tangs together in a very large tank, but I noticed that they don't often swim together. Not sure if yellow's are more prone to school together then sailfin's are or not, but that's just what I noticed.
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One more fish should be ok?, right!!!  - Laurie
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