What was the size of the blue tang and the foxface?
I have a foxface in my 80 and I am almost ready to have someone with a bigger tank take him. Those kind of fish really like a lot of space and they get pretty dang big. I made the mistake of getting a foxface and in hindsight would only place one in a 150+ tank and the same goes for a blue tang.
One thing I notice about my foxface is the he is a pig and can get a little scrawny looking if he isnt fed a ton of food every day. I am sure he makes up for a very large amout of bio-load in my tank (plus a gramma, two clowns and two PJ cardinals). I have seen full grown adult foxfaces and they get plenty big and fat, big enough to make an 80 gallon tank seem like a prison cell. Not to mention the blue tangs get much bigger than that.
Not to throw you under the bus about it, mind you. I have had stores sell me animals, swearing that they would thrive in my tank, only to turn out that they were wrong and I have another (insert animal here) death.
I also agree very much with fishsoldsepertly, There are tons of variables that come with SW livestock purchases. I had three green chromis in my tank with great params, all dead within three days. That was before I had the foxface too so my bioload was well within margins.
IMHO, I wouldnt put any fish in your tank that would ever exceed 4". Its like the time my wife really wanted me to get an imperator angel (juvenile) because they look really cool (I agree!). I only had a 50 gallon tank at the time so I did some research. Then I showed her a picture of the adults and how big they are.
The moral of the story, get your significant other to fall in love with a particular fish, and then use that as leverage for a bigger tank!
