actually today it seems to be gone, hopfully for good, it was just a little brown patch was there for about a week, but i add the garlic guard to his flake mabey that helped whatever it was
do you have alot of brown algae in your tank. Because my yellow tang has the same thing. But i realized that as he cleaned algae of the tank walls and sand, he was rubbing his lips against the algae which makes me think that the algae is rubbing on his lips.
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