i went to work this morning and turned on the lights and noticed these dark brown spots on my orange spotted file fish. Ive had her for a few years now she eats brine mysis rods lrs and just recently got her almost eating nls. i havent noticed anything out of the ordinary with her this past week. I noticed it this morning but she was swimming fine and I couldnt do anything with me having to go to work so I get back this evening and she is on the sand bed passed away with a couple hermit crabs on her. I attached a couple pics of her that shows the brown spots on her sides. Just curious if anyone had experienced this before or has had anything similar happen to them. Before anyone says osff are doomed and what not she has been with me for almost 3 years and eats pretty much anything I throw in the tank and has been healthy. She was housed with a couple cleaner, shrimp fire shrimp, a "super male" lineatus fairy wrasse, and a candy basslet and everyone else is perfectly fine. Ill test my parameters again in the morning but i test every monday and as of monday my ammonia nitrates were at 0 as of red sea test kits, alk 8.5 cal 420 and mag 1350. ive been in the hobby for 10 plus years but have never seen this happen before so i figured i would ask to see if anyone had any insight on the situation. thanks