small or large PBT?

[El Langostino]

At my LFS there is a 5 inch Powder Blue Tang that has been at the store in a tank running UV for over a month. The fish has nice color. There is a smaller PBT; about 2-3 inches which is a bit more pallid in terms of color and has been at the store for about 2 weeks

Which one should I get? I'm really wondering how long I can keep a 5 inch PBT in my 90 gallon.

 

[michindi]

Make sure both are eating. If the smaller one is eating I would get that one.