i still need a tang in some fashion to clean up my algea problem which is why i got him in the first place. him my 3 snails and 2 urchens seem to be fighting it back but it is not gone yet. my next step is to find a used 80-120 gallon tank and last resort is to trade him with the LFS for credit.A week perhaps. Keep in mind the tank is small so this is not likely to work long term as Tangs get meaner with age. So you will have to catch the Tang again to save the butterfly.
You should consider returning the Tang while you have it caught to save the headache since you have wanted the butterfly for so long.