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Looks fungusish. I am currently treating a betta for a similar patch. I am using Tetra Medica Fungi stop which is colloidal silver based. She has been in it since Monday morning (Sunday night by you). It seems she is handling it just fine despite dealing with a secondary dropsy infection, which I can't treat before treating the external wound.

It is 5 day treatment, seems to be snail and plant safe so far. It gives the water a slightly humic brown colour. But does not seem to stain like methylene based treatments.

You could also use CopperSafe, which is known to be safe for cories, but I can't vouch for plants or invertibrates, some research would be required.
 
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