Seconding that you seem to be doing the right things. That's a bad nose wound but as far as I can tell it doesn't look infected. Just keep an eye on it, maybe dab with antibiotic ointment if it starts looking worse.
You might want to look into "chromomycosis". That fungi can cause gray bumps on the skin. I'm not sure how good this information is, but I found this site which describes various types of fungal infections and how they look: http://frogworld.net/health/fungal-infections.html
You might want to see if any antifungal treatments for fish are available in nearby pet stores.
(Also be aware the frogs might try to eat some of the smaller things in the tank. Maybe not the fish, some people are able to keep frogs and fish together with no harm, but maybe the crabs or snails. Frogs have been known to try to eat rocks before!)





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