What the heck is up with my snails

[Ramdude4G]

Wondering if anyone can tell me what is on 2 of my snails? It’s a hard shell similar to their own. Never seen anything like it before. Has anyone else? I have a video but of course it won’t let me upload it. if you want to see the video pm me your number and I can text it to you

 

[Spieg]

The purple stuff is coralline algae... not anything to worry about.

 

[Ramdude4G]

The purple stuff is coralline algae... not anything to worry about.

No I know that. Lol. I’m asking about the clam looking shell that is growing on it. I have 2 that are like that

 

[Zach B]

Looks like a type of bivalve to me. I have one on a trochus but forgot the name...

 

[Sean Clark]

It's like a Bissell, it can clean hard and wet surfaces at the same time.

 

[Ramdude4G]

Looks like a type of bivalve to me. I have one on a trochus but forgot the name...

These are on Trochus snails.

 

[Zach B]

I believe it's called a slipper limpet

 

[Ramdude4G]

I believe it's called a slipper limpet

Thanks I’ll see if I can look it up.

 

[WheatToast]

I believe it's called a slipper limpet

Thanks I’ll see if I can look it up.

Personally, it looks more like a bivalve with the two shells, perhaps an oyster given the wavy opening (similar to the species of the Lopha genus).