Day 5 AM. Still see some semi-deflated tentacles. Can't see its mouth. Took a photo from behind the tank and no luck.
Still see some snot around. I trie to siphon as much as possible with the WC but it seems to be stuck to the rock. Right after pouring the new water in I see lots of particles come floating. I'll scrub the rock today before WC to try to clean it up.
From behind
Front of the tank (same view I've been posting)