Thank you so much for the links. Yes it looks similar but it is NOWHERE near as severe as that. He is already on paper towel substrate, but later on I will give the tank a thorough scrubbing and see if that helps matters.
Edit: I forgot to mention, I've been putting Neosporin on a mouse bite on his side. Based on the threads you showed me, that could be a potential cause too, I think.
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