Sick Tomato Clown

My water tested fine this A.M. Amon. 0 Nitrates & Nitrites tested okay PH was 8
only thing I did different was add some
dKH buffer in with top off gallon now My clown is away from anemone near bottom of L/R
and seems to be (panting) or breathing rapidly. All other fish in tank are doing fine. Any ideas anyone ?? Just seeing if he makes it thru the night now. :confused:
 
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