Hey I just noticed these tiny (1/8") snails on my tank glass. There are at least 10 I noticed. They seem to be good guys eating algae on the glass, but I would just like to know what they are. They look identical to a typical algae grazing turbo snail but just super tiny. I can't get my camera to focus on them they are that small. Weird thing is they also have a tiny shell that I definitely didn't put in there. Any ideas on the species? Thanks for any help.