Anyone knows what this is? ID?

[hkreefjunkie]

Hi all!
I recently found one of these sort of snail or something in my tank. Dunno what it is! Anyone know? It mostly comes out at night. I saw a big one and then 1 week later, I had like 40-50 of these babies crawling around my tank! I guess it spawned or something without me knowing! Would most appreciate anyone letting me know if it's good or bad for a reef tank! It looks harmless cuz I see them grazing on the glass and live rocks for algae.

[reefwars]

Stomatella snail

[hkreefjunkie]

Thanks reefwars! Do you know if it is good or bad for a reef tank?

[reefwars]

IMO they are bad only for the reason they breed easily, they are however harmless in a reef

[hkreefjunkie]

Thanks for your help!! Much appreciated!

[Proteus]

There population will depend on food readily avalible.

[PoonTang]

I used to have a ton of them. Then I bought a green corus wrasse. Now I have none.