White spots on live rock and back glass

[Bscivil99]

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]

Spirorbid worms most likely. Harmless filter feeders!

 

[Bscivil99]

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

 

[Adam Schindler]

Coraline algae dying off?

 

[Redfoxtang]

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.

 

[Bscivil99]

Coraline algae dying off?

I don’t think so. I just got Coraline to start to grow about 8 weeks ago. This is in totally different spots and getting larger.

 

[Bscivil99]

Yea usually hard flat and doesn't move.

I’ll go with that then, and will continue to monitor. Everything else in the tank including levels seem to be good

 

[vetteguy53081]

On the rock are nerite snail eggs

Nerite eggs:

Spirobid: