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Maybe a big swing in temp or salinity? If you check everything and your parameters are okay, then I'd just feed it heavily and hope for the best. It might go away in a few days or it might blind the fish in that eye. I'd do multiple water changes - every couple of days just to be sure. Can you test for copper? Did you pour fish store water in the tank?
I'd recommend not letting your tank get above 80.Salinity is good.
Temp I set at 78F - During the day it gets up to 81F is that ok? I read somewhere that 83F is MAX?
It's getting worse... The original eye is now bigger and the second eye is becoming bigger...

