I'm looking for some help identifying a spot on a Yellow Angel I have in QT right now. Fish was received on and entered QT on Tuesday. No signs of any symptoms, fish seems healthy at this point beyond this spot. At first I just thought it was a darker area and was just watching to ensure it didn't grow in size. Today I noticed that there's actually something sticking out slightly from the spot. Almost like a spine or something pointed. Any thoughts from the pics? I'm doing a HTTM QT and have treated with 1 dose of PraziPro so far, but have not done H2O2 yet out of precaution.