Algae I.D and snail shell

[Scousereefer]

Can someone tell me what algae I have on my rocks and is it good or bad.

Also what the white marks are on rocks and snails shell, aswell as the purple tip on snails shell.
Any advice will be appreciated

 

[KJ]

Can someone tell me what algae I have on my rocks and is it good or bad.

Also what the white marks are on rocks and snails shell, aswell as the purple tip on snails shell.
Any advice will be appreciated

Green cyanobacteria.
https://www.thesprucepets.com/cyanobacteria-blue-green-algae-1378628 Trochus snail good to have!

 

[Scousereefer]

Green cyanobacteria.
https://www.thesprucepets.com/cyanobacteria-blue-green-algae-1378628Trochus snail good to have!

Thanks bro, is the cyno a good sign? And I have a couple trochus, what is the bird poo looking white patch on it lol, it also looks like it has purple algae on it