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I think that sore as possibly been caused by Ammonia, what type of test kit are you using, Liquid or strips? If strips they could be giving incorrect readings, they are unreliable.

With no filter you need to be doing a 50% water change mid week as well as your current routine. Seachems prime if you can get it there would be the best water conditioner to use as that would turn any ammonia, nitrite to a less toxic form. And you can also add that to the water in drops per gallon I think to keep the ammonia detoxified.

At the moment you really need to be looking at keeping your water super clean to help his fin heal.

The other thing it could be is a tumour, but they usually tend to be a whitish grey colour. If that's the case then nothing you do will remove it.
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