White snowflake things in refuge. ID please

[bec1750]

Went into our refuge today and saw these on our glass. I have no clue what they are. They look like white snowflakes. They are on the glass. Here’s the best pics I could get. Can someone ID these for us and let me know if they are friend or foe? Thanks!

 

[Rtaylor]

Sponges, filter feeders, nothing to worry about

 

[ying yang]

Yeah looks like some kind of sponge but some look little like nudibranch.probably not though but if they mive then possibly but more than likely a sponge

 

[bec1750]

Yeah looks like some kind of sponge but some look little like nudibranch.probably not though but if they mive then possibly but more than likely a sponge

They aren’t moving. I’ve seen a nudi before and yup these aren’t one. So sponge it is I guess

 

[bec1750]

Sponges, filter feeders, nothing to worry about

Okay great! Thanks!