New find in reef

[Frtdrmrose7]

My 150 reef has been up and cruising for the last 8 mos. I was looking around after dark and found 9 of these throughout the tank. These are only out at night and not during the day. I thought they were a snail but I’m not sure because there isn’t much movement. Any ideas on what these are? Possibly a limpet?

 

[Peach02]

I've got one or two on my hermit shells and they seem to be going no harm, I think they are some form of barnacle, I tried to remove them with tweazears but they didn't budge

 

[rkpetersen]

Second and third pix look like keyhole limpets to me; not sure about the first one.

 

[Frtdrmrose7]

Second and third pix look like keyhole limpets to me; not sure about the first one.

They are all the same and I suspected limpets so I guess they will stay. Thank you