Id snails on glass

Aren they really really small and all over the place?

See if you can look at one under a microscope or large magnifying glass. Then you can compare the very small differences in shell structure that is needed to tell good snails from bad snails (that is, if you can't see their tattoos and punked out hairstyles, those are always the "bad" ones ;0 )

Check out this link for more details:
http://www.reefland.com/rho/2006/05/identify_rissoid_pyramidellid_snails.php
 
I have been on that site before, and it is a little dry and I still cannot tell the difference. I have no magnifying glass to check. But, the rissoids and pyramids have same larval stage? Should I scrape them off regardless and not wait for them to grow into adults and then be certain?
 
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