Hard white dots on rocks

[Krzydmnd]

Hi all! So yesterday I noticed these hard white dots on my rocks. They do not blow off and cannot be sucked up, and they do not scrape off. They are hard to the touch and do not move. Any ideas?

 

[Crabs McJones]

Hi all! So yesterday I noticed these hard white dots on my rocks. They do not blow off and cannot be sucked up, and they do not scrape off. They are hard to the touch and do not move. Any ideas?

They almost look like nerite snail eggs.

 

[Krzydmnd]

They almost look like nerite snail eggs.

That would make sense! I just added a few nerite about a month ago and they do hang out near that acro.