Trying to identify what these small snail looking things are in my nano?

[Jcs401]

I have hundreds of what look to be baby snails all over my nano reef. Can anyone please identify what these are, good or bad?

 

[aquandrew]

do you have any full size snails in there? or did they randomly show up? its hard to tell from the pic

 

[Jcs401]

I had many many snails.

 

[aquandrew]

when populations explode like that, it means you are over feeding. how often do you feed?

 

[Jcs401]

Honestly. Only have corals. Very very rarely do I feed. Maybe once every two weeks I spot feed