Mine has a brown mark as well, like a birth mark. It is under it's mouth. Darker than yours. Not sure it's an illness - check the molly's behaviour - is it acting weird, e.g. gasping for air, inactive, not eating normally. I'm not an expert but proper diagnosis is needed.
Angel Fish - fungus on spine, gasping for air - how to treat it?
One of my Angelfish has fungus eating into his spine. Small bits of fungus also erupting over his body - he's getting worse. It was first caused by a bite from a larger Angelfish.
I have treated with ESHA 2000 (2 courses of treatment) and with Methylene Blue (2 courses of treatment). The Esha when squirted over his fungus removed a little of it, but it keeps growing. I've dabbed the Methylene onto the fungus, it dyed some of the fungus blue, but did not stop it growing.
I need to know whether he is salvageable as its eaten into him quite a lot now. See photos.
If so, what product do I use? I can now only afford something that'll work for sure.
Need responses quickly please, otherwise it's painless euthanasia by sedative.