I added a new neon blue dwarf gourami to my 10 gallon tank. He developed a white spot over a couple days on his fin and was flashing against leaves so I immediately started treatment for ich by dosing with biospheres maracide(malachite green?). Today is the tanks last dose and I noticed one of the gouramis eyes was turning white. His other eye is just fine he isn't showing any other symptoms. The white spot on his fin finally dropped off after a couple days. What is wrong with his eye?