Help ID new snails?

[lwhite2]

I've seen a few of these in my tank. I introduced margarita snails, mexican turbos and astrea turbos. These guys showed up and I caught some photos one night. They could be hitchhikers or born of my tank. Any ideas?

[D12monkey]

Got any better pictures?

[FragOutpost]

Kind of difficult to tell for sure.
The first pic looks a little bit like Heliacus sp. - http://www.meerwasser-lexikon.de/index.php?kategorie_id=71&tier_id=955&sprache=eng&name=Heliacus%20sp
Not sure though.

[D12monkey]

Could it be a mexican turbo snail? AKA the Baja turbo snail. The photos make it very difficult to Id.

[lwhite2]

Sorry, I don't have better photos at this point. But I will watch my tank. They were about 1 cm in size when I saw them and took these photos. Haven't seen them since.