My 2-3" Datnoid has this fleshy growth on one side of its jaw, now it has spread inside/protruding from its gill plate. It is also growing along the edges of its dorsal spines. When I take the fish out and scrape it off, it starts growing back within a day and is spreading. I've included a photo of the it removed from its gill. What kind of Meds do I need? 
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