Coral? Something else?

[killer2001]

Got some Tampa Bay Saltwater live sand recently, and I spotted this today observing my tank. Looks encrusted onto a small piece of rock. The little polyps will retract into their tiny holes when touched. Any idea what this is?

 

[vetteguy53081]

Pic a little fuzzy to tell

 

[WheatToast]

Looks like a bryozoan:

Grey: I think these are bryozoans, which are filter-feeders. I never had success with them in my temperate tank.

Bryozoans:

 

[WheatToast]

@LiverockRocks

 

[LiverockRocks]

Looks like a Bryozoa - Sea Mat - Biflustra tenuis

 

[killer2001]

Yep! Looks like it. Here's the best picture I could get, polyps retracted.