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I don't have any of those fish but I'd separate him into a 'hospital' tank, give him some meds for about 3 days, doing 100% water change adding conditioner of course, make sure water temp matches. Check your water parameters in original tank for amonia, nitrite and nitrates.
Ya there fine it's just the one I mean other people I have talked to said he might be getting picked on is that a solution because he stays in one spot. He refuses to eat and he avoids the other 9 tiger barbs