ID needed - what is this?

[Zoaelite]

Both very plausible IDs, also possibly coraline algae. Any way to take a closer photo?

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[tobysmurf]

Apparently I am the worst photographer in the history of aquaculture. My crappy old Nikon and I were only able to zoom in a bit further, so all I could really do was go to manual focus and then crop the photo. Here is my attempt to make this more visible:

[Zoaelite]

I lied, that zoomed photo confuses me more .

Nothing to worry about though, all natural in a reef tank and its not going to hurt anything.

[tobysmurf]

Awesome, thanks for the peace of mind!

[toytech]

They are small tube worms , i have them in my display . When they die the shells stay that color forever and are very hard so they stay on stuf for a long time . Those are probably dead ones .

[tobysmurf]

Oh, ok. Some of the spots are getting larger every day so I was curious. I have some feather duster worms that seem to have magically appeared as well. Considering this "live" rock was left outside in buckets in Calgary from May until October I am pretty impressed that anything is alive at all.

[subman]

They are vermatid snails and I would get rid of them ASAP they will become a plague over time. I have you fed the tank yet? They will send a mucous net to catch any food or debris.