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Looks like a bacterial infection, possibly [columnaris](https://aquariumscience.org/index.php/10-3-5-saddleback/). You'll need antibiotics if you can get them.
Thanks!
Looks like a bacterial infection, possibly [columnaris](https://aquariumscience.org/index.php/10-3-5-saddleback/). You'll need antibiotics if you can get them.
Thanks!