Snails in my sump

I think these are Nerite snails. My sump is completely empty but somehow these guys always show up. I suppose their eggs are being sucked in by the overflow? The weird thing is that I don't think I have any adult Nerites in my tank. Oh well.

I was just wondering if anyone could tell where they came from, as in, which ocean?

Thanks!

 

This thread could (should) probably be moved to IDs. Thanks.

 

Sorry to say, but I believe those are sundial snails. They prey primarily on zoas.

 

+1. Nerite snails don't hatch in saltwater. Only in brackish water I believe.

 

I hatch plenty in my tank, olives and virgins.

 

collonista snails

they are good cuc, albeit tiny. I've been seeing lots of tiny snails, I was hoping nerite, but I'm fairly sure they are collonistas.

sundials have similar coloring but they are different.

 

Well I'd certainly hate to lead someone the wrong direction, especially since sundials are harmful and collonista are not, so I'll be perfectly honest-- I can't quite make out the shape of the shell in the image. Here's a photo of collonista:

http://i172.photobucket.com/albums/w16/jAb83_2007/collonista-1.jpg

If the shell is coned like these, then they're definitely collonista. Sundial shells are spiraled but perfectly flat. Both are tiny, btw.

 

They look like sundials to me also,mabey PagoJoe will chime in or you could PM him.

 

They don't have any cone as far as I can tell. I'll keep an eye on them, so far my Zoa's are doing okay. No snails on them yet. *crosses fingers*

 

That's an excellent start. If they were sundials, they would be on the zoas. You will only see the snails on them at night; however, since they only graze on the colony, you would notice the zoas shrinking almost daily for just a few weeks then the polyps would start disappearing.