Snail id

[Rottinggore]

i have a bunch of these little snails and I'm not sure if they are good or bad. Any help would be greatly appreciated.

 

[cloak]

They might be Collonista snails. (harmless grazer) These usually hitchhike their way into our tanks via live rock, corals etc.

http://reefkeeping.com/issues/2004-05/rs/index.php