White spikes on coralline algae

[jujumaster89]

I have some spots on my purple month that have been overtaken by coralline algae I think. At the perimeter of the corral one are these odd white spikes. Any thoughts on what this is?

 

[jujumaster89]

It may also be happening with my lepto. Look at top of drag where it was starting to encrust into the rock.

 

[Greg P]

Looks like Vermetid Snails

 

[mikereefing]

Looks like Vermetid Snails

I think so too...OP do you see these "white spikes" anywhere else in your tank? I have a vermetid infestation that grows on my coral skeletons and under rocks. I go in with my bone cutter to nip the snails at the base.

 

[jujumaster89]

Ugh. I was about to say I used to have them... but I know better. The large ones have long ago been encrusted with coralline algae. Could that explain this weird growth pattern just above this new acro?

 

[jujumaster89]

You can see an example of the snails that have grown over below. They are much bigger than these new guys