Thank you NYY for your help... I was being eaten alive. I too know someone that has kept tangs in smaller tanks (a 29 gallon), and I think its possible to keep some types of tangs in smaller tanks while they are small. Obviously when the thing gets larger something will have to be done; nobody wants a sick fish or skyrocketing ammonia. While its small though, I'm keeping it. I also have kept pygmy angels in this reef tank, and have had no problems, to add to that comment.
As for the other tangs dying, one was sick when I bought him, and the other died because someone else was taking care of my tank while I was in Italy for 2 weeks. He messed up the salinity by not adding water and over fed them. (Read what I wrote before) Both weren't my fault, and the deaths werent because my tank is too small or because I dont know what I'm doing.
Maybe putting a tang in a 37 gallon makes me a rogue saltwater fish guy or something, but I'm not in this hobby to kill fish, its too cool and too expensive. Something to think about though: Aren't we are all taking these fish out of their natural environments, flying them thousands of miles and keeping them in our living rooms? Also, many of us buy live rock broken off natural reefs in the ocean, so maybe we should all think twice before throwing stones. Just a thought.