Can someone tell what are these tiny things ?

[angelf13]

They are only multiplying in my refugium and the look like tiny snail but they just grow all over and must scrape them off

 

[Cubano32]

They are only multiplying in my refugium and the look like tiny snail but they just grow all over and must scrape them off

I have the same thing

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[#theMatrix]

Spirorbids.

Are you overfeeding?

 

[Codeman28]

Yea, I get them too.. they are like tiny calcium deposits.

 

[goat585]

I used to get them too but mine looked like little tube worms.