Usually from water quality issues. Would check that ASAP. If those are all in check meaning 0 ammonia, 0 nitrite and under 40ppm nitrates then Maracyn2 will help but do a big water change prior to that.
Water is good. 0 of nitrites, ammonia, and nitrates. I have done a big water change. I’m treating right now for ich, and I’m in post treatment now or whatever you wanna call it. No fish have symptoms anymore. So I am still just adding paragard for that. Here’s another pic, don’t know if it’s any better though. Had to take it between a plant cause he was in the back. I’ll try again later.
+1If thats true and ALL your parameters are reading 0 it might mean you have an un-cycled tank, unless it is extremely heavily planted...
pH has always been steady at 7.6+1
Ph swings will also cause eye problems. Do u know ur prior ph values?