Nassarius snails breeding

is there any way for me to tell if these are predators? I cant believe how many of them their are now... Would a better pic help identify if they are good or bad?
 
I have SEEN my Nessarius laying eggs probably 15 times (always in the early morning when i'm leaving for work) the babies don't look like the big nessies though, and mine don't survive past corn kernel size
 
There aren't any reliable reports of N. vibex grazing and in the unlikely even that it did injest some algae, it's internal anatomy isn't adapted to process it.
 
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