I swear this doesn’t happen often but my mushrooms been going limp. They’re usually flowy and do stand off a bit from the rock but everyone once in a while they’ll get droopy like this. It’s usually not a problem but this larger one in the front has been stinging corals.
Probably time to trim them. That’s what mine were doing, and shading each other out. So they end up extending like crazy. Razor blade or scalpel close to the rock and a new one will grow in its place. That’s why this rock looks like this now