I just turned my light on in my 20g tank and one of by tiger barbs is ballooned out like a puffer fish with its scales sticking almost straight out. This is the first time in over two years of keeping fish that I have ever seen anything like this. I am wondering what it is and what to do about it and if any of the other fish are in danger. All the other fish look fine at this point. I don't have a quarantine tank to put him in either. Any help would be greatly appreciated. Also, the other tiger barbs are trying to chase and nip at it.
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