A couple days ago my betta had a tiny grey dot, I put in medicine for fin rot thinking that was the problem but it has only gotten bigger. The grey is now on most of her body. I don't know what can be wrong, planted tank (13 gallons), loaches, and some danios in with her. Lost two danios as well they were discolored when I found them this morning. Ammonia is fine, temp is always above 77, ph tested okay this morning. Normally do weekly water changes.
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