I have had my yellow tang for almost 2 months, lately last 2 days he has developed red along the base of his tail fin, both on the fin its self, and on the body. and today the red has spread along a lateral line along his body. I have seen no other spots on him, but he has been scratching himself repeatedly on the rock, and swimming front and backwards acting really different.
Also, how can I decrease Kh
mine was low, I was told to put purple up in to increase them, but now they are to high.
Current water is:
nitrate 0, PH 8.2, nitrite 0, ammonia 0, calcium 360, temp 78F, SG