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Where did the rock come from?Any idea what these gray looking splotches are on my rock? The left-most one seemed to have moved from underneath another rock- possibly some kind of invert?
It’s live rock bought ~60 days ago. I did a fishless cycle so any sponges/critters on the live rock should be dead AFAIKWhere did the rock come from?
Left almost looks like a mushroom, idk.
The others look like sponge.
Sponges would be my first thought, but not many sponges move. Do they all move, or just the one on the left?Any idea what these gray looking splotches are on my rock? The left-most one seemed to have moved from underneath another rock- possibly some kind of invert?
The sponges actually haven’t moved- I think it was a blackish Asterina I saw and thought it was the sponge.Sponges would be my first thought, but not many sponges move. Do they all move, or just the one on the left?
If it's just the one on the left, it's possible that you could have a sponge-mimic snail or nudibranch, but those are very rare in the hobby.