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Betta Fish

Betta Fish: Is this fin rot?

I got this male betta on October 13th, when I got home I took some media from my other aquarium and added it to the 5 liter aquarium that I had for him at the time. I noticed that he had red dots on his tail, so I medicated him with aqualife and then started the 5 days of Atlantic Bacteria/Fungi.
On October 22nd, my new 30-liter aquarium arrived, for my 3 female bettas who have sorority, so the 15-liter aquarium for him was vacant. I divided the aquarium water and the media. So far so good, he loved the space and so did they.
Today, October 25th, I noticed that his tail opened… In other words, his case went crazy, I don't know if it was fin rot or something else, the parameters are normal, he has a filter with light flow, natural plants, fine sand substrate and a nice trunk, he lives alone so he doesn't get stressed.

I need help with the right treatment!

https://www.reddit.com/gallery/1ofpqjz

Posted by BeginningOk5662

6 Comments

  1. Loud-Strawberry1311 on

    what size is the tank in the photo? what are you using to test the water and are you using a water conditioner?

    edit: i also don’t see a heater. does his tank not have one?

  3. sew_hi on

    It sounds like your set ups, especially the sorority, are not meeting the basic minimum care requirements.

  4. Lady_Penrhyn1 on

    None of those tanks are suitable for your fish. A single betta needs a 20l minimum and sororities are notoriously difficult to do, require large, heavily planted tanks and at least 5 females.

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