My fish has a red sore on her gills and is acting sickly?

Maria

New member
My platy lives in a 100l tank, set at 26C and cycled. She lived with 5 other platys, one three spot gourami and a school of neons. Recently she developed a red sore-like thingy on her head, on top of the gills, her tail fin looks like its almost shredding and she is gasping for air. She also seems like shes missing a few scales. Is this ammonia poisoning? I tried to treat her with antibacretial, but if its ammonia, Ill have to do a totally different treatment water changes etc
 
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