60 Gallon Tank Anyone know what’s wrong with my cherry barb?

My barb has been like this since the morning. He’s really wide, like his body has swollen. Since the picture, he can’t stay upright and the his scales are pointing out a little bit. I was worried he may have pine coned but they seem more inflamed than pine cone(it’s not as bad as pictures I’ve seen online). Anyone able to help?
Ammonia 0
Nitrites 0
Nitrites 20ppm
maybe he has swim bladder? Try quarantine... I have not seen this before so I can't really help you, sorry!

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