With Pima fix You will be removing that Ray dead very soon. That Ray has simple scrapes . You can see it freshly used its stinger also. Pima fix and melafix are not even medications. They are herbal garbage and will only kill your healthy Ray. Walmart and every big store that has a fish section sell Pima or melafix. I tried it once about 8 years ago with advice from somebody and it only harmed the rays. Do not add it. If you need to clear up bacterial issues on your Ray or fungus get kanamycin sold in ever pet shop as kanaplex. If you use meds wrong you can easily kill rays. I've been keeping rays for ten years and rarely loose rays and rarely medicate them. Rays sharks are sensitive to meds in water and drives them crazy. Even meds like praziquantel drives my rays nuts until it's flushed out. There liver will take abuse randomly adding meds. In my opinion there isn't a thing wrong with your Ray looks just like its scraped the skin off his spines. Post a better picture