I feel like these snails put everyone in a panic. Seems to be the most common hitch hiker question.
Why can't I get more of those to pop up on my live rock?
Some person said they had hundreds in their tank and was complaining. You can get them on eBay but they are expensive.
I told that person to sell them.
If you have several they all get on something and spawn into the water at the same time.