White spots on live rock and back glass

Bscivil99

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Can anyone tell me what these white spots are on my live rock and back glass? I have noticed them for several days. They are getting larger and multiplying.
 

Redfoxtang

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Spirorbid worms most likely. Harmless filter feeders!
 
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Bscivil99

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Spirorbid worms most likely. Harmless filter feeders!
I peeled one off and it’s flat and doesn’t move. Almost like a small hole punch of paper. Does that sound right? Thanks for the quick response
 

Redfoxtang

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I peeled one off and it’s flat and doesn’t move. Almost like a small hole punch of paper. Does that sound right? Thanks for the quick response
Yea usually hard flat and doesn't move.
 

vetteguy53081

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On the rock are nerite snail eggs

Nerite eggs:

1591144327117.png


Spirobid:

1591144359468.png
 
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