snail ID

[alexg5085]

Hi
i have around 1000 of these little snails that come out at night i mean the completely cover my live rock and even getting stuck in my MP60s
Please could you let me know if they are bad and how to get rid of them if i need to.
photos below

 

[Mike N]

They appear to be collonista snails. If so, nothing to worry about.