one of my platy's has like a rash looking soar on his sidee. I think he got it while flashing. its like scraped it really hard and he is acting really wierd. he wont stop moving and is staying in the current my filter is making. most of my platys also have red gills and some are flashing. I've added salt as much as they told me to. my ammonia is a about 1.5 to 2. what medication should I put in the tank. please respond quick!!!!