Baby snails

[Aqua]

About week ago I was quite surprised to find something that looked like mini snail behind powerhead. Close investigation showed that I have at least 8 of these baby snails, 2 in main aquarium and 6 in the sump. It could be that I have more but they are so hard to see. They are quite small, less then ¼” in diameter. I have 7-8 adult Turbo snails in main aquarium.
Tried to find more information about snails on the net but all I could find is either useless or confusing so here I am with some questions for you.
Is this something you see in your aquariums regularly and how these snails reproduce?
I have only 2 not so great photos of baby snail since they refuse to pose.

[Flame*Angel]

I have these as well. Ron Shimek identified them as a type of limpet. This site has some id info:
http://ourworld.compuserve.com/homep...SS/Limpets.htm

[Aqua]

Susan thank you so much.
It does look like it. At least I know what they are. So that must be their normal size since last live rock I added was 8-9 mounts ago.

[Flame*Angel]

Well, there are a lot of different types of limpets. The ones I have never seem to get very big. There are a predatorial kind too but I believe these are fairly rare. Look for a tiny hole in the top of the shell. I believe they are called keyhole limpets.

I'll bet they came in on your rock as cysts and just hatched not long ago. This happened with me when my tank was about 6 months old. I suddenly had literally hundreds of tiny round snails unlike anything else in my tank. They would only come out at night. Then they just seemed to go away. After I switched to natural seawater they came back.

Lots of little mysteries in reef tanks

[john rock]

I have them as well. harmless from what I can tell and don't move much.