They are 8'x2'x25"or 5'x30"x30". Each one has it's advantages but if u want a reef eventually 8ft is way more to light however there is almost no fish you couldn't keep without fear of it getting too big.
I was scuba diving with them and i dont know where you live, but its illegal to kill them where i live.
Those fish get huge.... I swam with one the size of a basketball. They should not be in aquariums in my opinion. If you dont have a 500 gallon tank i wouldnt even consider it, you have to see how big they get.
I live in ca and when they get that big then I would re home. I just like the experience and saying yeah I ha that an this is my opinion. Lol. So prob doin a 250 like mr d and myself were talking about.