Any idea what this might be?

[GilliganReef]

A few weeks ago I looked in my Refugium and I found a snail in there. I have never placed a snail in there prior. So I just assumed he either manage to make the long journey from my DT or grew in the sump. Last night I was looking at my tank and found these little guys. What are these? Could this explain the rogue snail in sump? I was going to post last night, but I had a video. Video is still pending on YouTube. Will post video when available.

Snail in sump

Small creatures - What are they?

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[mcgyvr]

More snails..
babies... Snails do readily reproduce in aquariums..

Many snails are hermaphrodites so they can make more all by themselves..

 

[Ron Reefman]

It looks like you might have vermetid snails (down in the lower left corner of the 2nd pic). The ones that look like a small coil and after a few winds they turn away from the rock.

The white thing in the middle looks like it might be a sponge, but that's really a guess based on the photo.

 

[homer1475]

Snails, baby snails, and vermetid snails.