so when i got my crowntail one if its fins looked shredded but didn't realize until when we got him home. have had him for about a couple months now and have noticed when i was changing his water this evening that he has blister like bubble on that fin adn i was hoping that maybe someone can tell me what caused it or is causing it and hopefully a treatment for it. any help is appreciated. sorry if photos are kinda big just hard to see it.
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