diver28,
I grew up on an Island too. Though I swam away from the sharks !

OK getting back on topic, a long time ago when I was younger I was told 10 gallon per inch for saltwater fish. This is not the case anymore. With all the advances in protein skimmers today, more and more saltwater hobbyist are increasing the number of fish they keep. So just start slow, you will know when the fish feel over crowed. They will start to fight amongst themself more. IMO just the tangs you want would be too much for that tank. Except for the yellow tang, the rest can reach lengths around a foot long.

The ocean is so big, and our tanks are so so small.