Help!!! What's this thing

While cleaning my tank I noticed this weird sluggish slimy thing one of my rocks and can't figure out what it is for the life of me and don't want to remove it if it's beneficial for my tank! But don't want it in there decaying or whatever that thing is doing in there!!! I am a very established for for 1 year and everything in there livestock wise is doing phenomenal! No anything! So I have no clue what this thing is
IMG_20250718_125730_937.jpg
Hopefully someone here will identify.
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