Identify this please

[JRdgz]

Can someone please identify this pest or what it is. It’s hard and it’s living in my sump. All my corals and fish are fine. Everything is wonderful. It’s been there for more than a year but i just want to know the name please. Maybe a baby snail I don’t know ‍

 

[fishguy242]

hi ,is a chiton ,harmless in sump,some species eat coralline.

 

[DWPhilli]

I think they are limpets

 

[Stuartmercer]

Based on the first pic, looks like a chiton based on its long flat appearance.

 

[JRdgz]

I think they are limpets

Yes they are thank a lot