Whitw smooth bumps showed up on overflow

Court_Appointed_Hypeman

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Wondering if anyone is familiar with what these may be. You can see spirobid and pineapple sponges for scale.

The larger white smooth bumps are whay I am trying to identify.

They first showed up a week ago, I noticed the day before my cleaner shrimp was digging at this spot, and it was like the next day they were there at this size. Have not changed since.

Googling hasn't resulted in anything yet.

20230706_183920.jpg
 
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Court_Appointed_Hypeman

Court_Appointed_Hypeman

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Do you have snails?
Lots of em, all of them seem to lay eggs. Ceriths and nasssarius on glass, and I've been seeing baby astrea which is the other type of snail.

I also recently added some narite, bit I think these appeared just before that. I haven't yet seen the astreas lay eggs, but assume they must have.
 

JGT

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Pic is a little hard to see so I could be wrong. I’ve had them and they are a bit bigger than a sesame seed.
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

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