Invasion Of The Cerith Snails!

[FLricordia]

I just got back from checking on a friends 240 I am maintaining. I set it up approx 4 months ago and except for some diatom on the sand and glass it has done pretty good. Mushrooms, blasos, hammer, green canycanes, coco worms, brains, all have grown and are doing great.
I noticed tonight about 500-1000 (I kid you not) tiny pinhead sized cerith snails have appeared. They are all over the sand and glass. None I could see on any corals. What will happen? Do I need to syphone some out?
I have no idea where they could have come from. I check on the tank once a week and didn't see them last time but numers could have been low so I didn't notice them.

 

[ACBlinky]

Can you get a picture of them? I had what I thought were baby ceriths, turns out they were pyramidal snails (snail/clam parasites). Hopefully I'm wrong, but you might want to run a search to find some pics of pyramid snails just to make sure that's not what you're seeing.

 

[greenbean36191]

It sounds to me like you're seeing rissoids, which are harmless detritivores. If they aren't on mollusks, they probably aren't pyramids.