Small white circle worm like things on glass

[Sleeman]

Hi all,

I tend not to panic when i see weird things in my tank anymore, as ive learned new tanks have all kinds of "what the heck is that" cycles, but I'd still like to know if anyone has a guess.
I have a 32g fluval thats 5 months old, this morning I noticed these little white circle worm like looking things on the glass.

First thought was the white type of flatworms, but they don't have a spade head looking part, they're perfectly round.

Second though was Asterina stars, but they reproduce by splitting, and don't grow out from some small white dot.

Sorry for the bad pictures, couldn't get it to focus any closer.

Any ideas would be great,
Thanks

 

[c_johns89]

They are probably spirorbid worms

 

[old salt reefer]

I think snail eggs(nerite snails to be exact).

 

[Sharkbait19]

What are the chances it’s early coralline growth? Mine sort of started like that.

 

[Sleeman]

I think snail eggs(nerite snails to be exact).

Oh, looks like a pretty good guess to me looking at other images. I did get some Nerites a few weeks ago, thank you