After doing some research myself it seems that it is a fungal problem on your ray probably caught by another fish with ich
No sadly has refused food . We don't have prazi over here but fluke solve contains praziquentialI had this on my Marble come and go and both times she stopped eating. Also prior I ordered a wild marble that came in skinny and wouldn't eat for 40days and a few days before she died her whole back was covered the same way.. That recent marble the last time she got it and she stopped eating. I immediately added prazi and it went away and she started eating. I assume it's a weeken immune that allows this bacteria or fungus to infest because both times there was other rays amongst the mentioned two and they did not have it. Is she eating?
Should I add fluke solve ?
Yes it's our versionI don't know if it's a fungus or bacteria or flukes or whatever but I know prazi made mine start eating and made the white go away. This makes me think this is a external pathogen problem making the white irritation. I would add the fluke solve if that is your version of prazi pro absolutely