mardarin in a 20gal?

[marie]

I've had my mandarin in a 75g tank for 4 yrs, packed with as much live rock as I could cram in without the tank looking odd. It took a couple of years before he would eat prepared foods and until he did I worried constantly that he wasn't getting enough to eat. I wouldn't chance it if I were you and definitly not when the tank is only 3 months old