what are these

nathancaspi

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any idea what this is on my rock and if it’s good or bad they look fuzzy

DD699D97-999C-421A-8B9B-0EB86D31F9A9.jpeg 231E7AB3-8083-4B61-937A-09AB75FCAB08.jpeg D76BFEB6-5074-47AE-9240-D9001E1B4788.jpeg
 

WheatToast

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Those are Pineapple sponges. They are harmless filter-feeders (feeding on phytoplankton and bacteria, though I have never had to supplement these to keep these sponges alive) and should never be removed from the water as this traps air bubbles within their cavities, killing them.
 

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