Fuzzy lion with white cloudy eye - help

He is about 4" long and has been in the tnak for over 8 months. Everyhing has been good until yesterday I noticed he was not swimming like he used to and I saw his right eye is totaly swallow and cover with cloudy white patch. What might that be? I am battelting with ich with a PB tang laterly, would that be the cause of the lion's white eye? Please help, I do not want to loose him.
 
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