What else do you have in the tank?
Put more air in the tank.
Get more water movement.
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What else do you have in the tank?All the fish in my 75 gallon tank are fine and my parameters are in check. But recently my angel has been gasping for air constantly having his mouth open, now it looks like he is missing half his mouth. Also he is sinking to the bottom and really struggling what do i do???????????
^These type of threads are much more productive if a picture is provided. Your description of the problem does not necessarily mean it is fungal or columnaris. The first step I would take with any illness though is a big water change before any other treatment.