what are these white things on my back wall

[Susan Edwards]

I have these white things on my back wall. They are not trochus snails. Bad pics but I get get better. They look like snails of some sort. As far as I can tell, they are only on the back wall where they is some algae

they seem to be oval in shape, though there might be 1 or 2 trochus in there. Looks like I can see tiny feelers on one end. The last pic all the way down you can see the shadowy feelers.

 

[evelio118]

Looks like limpets

 

[Fishtank603]

Not super helpful but they are snail I can’t remember what they are called my buddy calls them reefer herpes lol

 

[Reefahholic]

Looks like limpets

That’s exactly what they are.

 

[Susan Edwards]

Looks like limpets

I was leaning that way. There was so many, and I wasn't sure that all were alive, I did clean the back. And now they are back. I'll leave them. They are eating what is on the glass. Need them bigger to eat what is starting on my rocks lol's