i have had my yellow tang for about 2 months now and all has been well until yesterday when i noticed some black spots on him, they look like tiny fleas. i havent had any desease problem at all in my tank before and when i bought him the LFS told me they used copper in their tanks. i checked the books i have and i cant find any good info on what i am seing, and i dont have a QT. can a fresh water dip help this problem, or should i take him to the LFS? thanks for your time and knowlage.