I am gonna assume water quality is good across the board. if this is true and he is itching a freshwater dip would do some good. it should not be too stressful seening as he is still eating. if it is an external parasite i would say this should do the trick though you may want to give him a dip several days in a row gradualy increasing the amount of time in the dip each time.
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pretty big....not that evil......
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