Baby Trochus snails

[Murminator]

A few days ago I noticed a small baby red banded snail he was so small his shell was almost flat made me think hmm where did that come from? thought maybe a hitchhiker. Well tonight during a water change I noticed about 15 or so in my sump some are fairly small and a couple are the size of dimes but their shells have a very shallow cone to it it barely come to a point. This kinda made me excited woohoo free snails, I did have snail eggs about a year ago in a different tank but I cannot imagine these are from them.
Anyone else bred or raised snails......besides freshwater those are easy

Oh and before anyone asks they are not Collonista snails I have both and I know the difference