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Hi and welcome to the forum
It looks like a wound, possibly from fighting or cutting itself on something in the tank. They normally heal up by themselves without medication but it depends on how long it has been like that for. If it's been like that for more than a week and is not getting better, you might need to treat the tank with a broad spectrum fish medication.
How long has it been like that?
Hi and welcome to the forum
It looks like a wound, possibly from fighting or cutting itself on something in the tank. They normally heal up by themselves without medication but it depends on how long it has been like that for. If it's been like that for more than a week and is not getting better, you might need to treat the tank with a broad spectrum fish medication.
How long has it been like that?