If all your water parameters are ok I would suggest setting up a quarantine tank and getting him in there asap. a 10 gallon walmart setup will work fine. and you can use water from your main tank if parameters are ok. I am not 100% sure about this but I am wondering since there are 3 clown fish if the 2 that are most likely paired are picking on the other one. Someone can probably help you out with this a little better. GOOD LUCK
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