Can someone please help identify this white stuff on my clown fish ?
This is one of 2 clowns in my tank this guy's had problems since the second day I've had him and he's going on a month now.
First problem I saw on him when I got him was a white cotton type white fluffy thing near his tail fin but on his body. Then half his tail went missing everything went back to normal, white fluffy went away, then tail grew back. But now he has this white suff near hiS gill. Can anyone please help identify this and help treat it?

This is one of 2 clowns in my tank this guy's had problems since the second day I've had him and he's going on a month now.
First problem I saw on him when I got him was a white cotton type white fluffy thing near his tail fin but on his body. Then half his tail went missing everything went back to normal, white fluffy went away, then tail grew back. But now he has this white suff near hiS gill. Can anyone please help identify this and help treat it?