Fish lost, 99% sure dead

[corpusse]

I would try and find him. I just lost my chevron tang who was maybe 7.5" or so. I couldn't find his body at all. He died when I was away. I got home thought hmmm everything is okay I'll do a 50g water change (180 as well) everything will be fine. Nitrates crept higher and higher and there probably was an ammonia spike. I ended up losing a bunch of sps corals plus having to do two 100 g water changes to stabilize things.