he probably had a disease known as pop eyes, the eye will get larger and larger like a balloon, somehow to virus got to the back of the eye and infect it, i dont know how to treat it only saw what happened.
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55g AGA 55lb LR, 55lb sand, CPR skimmer, magnum 350, koralia 1.
in progress:
120g RR, 40 sump/fuge, panworld 50pxx, 2 x 250 Lumen Bright Reeflux 12k coralvue ballst, 2x54 t5 current usa, 24 led moonlight, shallow sand bed, 2x Koralia 4, around 200lbs rock, msx 200, aquac phosphate reactor... If you see something better out there, let me know. most of the parts still being process. | 
new flame angel...possible illness 
