My betta fish has a spot on its back. Is it fin rot? How to treat?

Question

When I was cleaning my fish tank i noticed this thing on my fish's back. He swims normally still. Is it bad? Any concerns? What can i do to help? Pet's info: Fish | Betta | Male | unneutered | 1 year and 6 months old

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

That could be a spot of fin rot possibly coming from bacterial infection or an aggression (and secondary infection). Generally speaking you can follow these guidelines: - set up quarantine tank: make sure the tank is well oxygenation and has some plants for hiding; - add 1 teaspoon of aquarium salt per gallon; - add this product https://www.liveaquaria.com/product/4410/?pcatid=4410 as indicated; - leave your fish there and feed him regularly for 3-4 days until you don't see any improvement - If no results at all are seen after 4 days a check up would be needed as more specific tests may be needed to establish a diagnosis. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. Please find the time to give us a feedback about the consultation as that will be used to improve our service.

My betta fish has a spot on its back. Is it fin rot? How to treat?

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