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I've done all above. My water parameters are good, it's only that one fishCheck your water quality for ammonia, nitrite, nitrate and pH.
Wipe the inside of the glass with a clean fish sponge.
Do a 75% water change and gravel clean the substrate.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media/ materials in a bucket of tank water and reuse the media. Tip the bucket of dirty water on the garden/ lawn.
When fish lay in their side and breath heavily, it's usually a bad sign.
I've done all above. My water parameters are good, it's only that one fish
0 ammonia, 0 nitrite and 10 nitrateIt is helpful to have the numbers. Different people have varying ideas as to what is "good," so the numbers for any tests will clarify things for the rest of us.