ok so i went to visit my parents for the weekend and when i got back on tuesday i saw that my young midas (about 4-5in) had a clear bubble on the lower 3/4 of his eyeball. its not pop-eye as its not his actual eye bulging out its just this weird bubble on his eye, well i immediately did a water change (as i will admit i had been kind of slacking on lately but ive gone 3 weeks before without changing and nitrates never went above 10-20ppm since all my fish are still young, so didnt really think anything of it and none of the other fish are ill) (though i think i hadnt changed the water in 4-5 weeks this time, its the longest ive gone without changing usually i try to do weekly or at least every two weeks water changes but got busy with final exams this past month
) well the next day it looked like the bubble had deflated and it and his eye are now a whitish cloudy color. When i saw this i added salt to the water to see if that will help and finished dosing today so there is now 2tsp per gallon in the tank and i raised the temp to 84. do any of you know exactly what this is? and can it be cured with just salt or do i need to separate him and medicate? i really like this fish and want him to pull through so any advice would be great