Set up a QT Tank.
First, I dropped the salinity of the QT to about 1.019-1.021. This is to free up their energy resources to fight and get through the stress.
Day 1: Formalin (about 4-5 drops) in 5 cups of freshwater from the tap, matched temperature , and dechlorinated. I use Seachem Prime. The amount of freshwater to formalin is approximate, but do not go over 6-7 drops in that amount of water. Also, do not have the temperature above 80 when doing this because the formalin affects oxygen availability in water at higher temps. I use a small air pump and drop the tubing into formalin bath for the duration of the dip. Add the fish, observe for the first few minutes to make sure they don't go into shock. Leave the fish for 5 to 8 minutes (no more). After put the fish back into QT.
Day 2: rest
Day 3: Repeat day 1.
Do this for a total of 4 baths and you should see improvement.
This has worked for me with my Clownfishes in the past.
You must monitor the fish the whole time, if they show distress, remove them. Sometimes when the fish are first dipped, they fall over like it's the end of the world. If you give the container a little tap and snap them out of it, they should recover fine. If they look like they are struggling take the fish out. I would say you have to do this when you first catch the problem, while they are eating and still strong enough to take the stress of the baths.
Good luck!
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