Bingo !!

Vermatid snail
 

The Vermatid snail are all over my rocks. I think it might be too late to do anything but there are ALL over all of my rocks :( r they bad for the tank?

Back to the lepaestrea, I bought it a couple days ago and it's cube shaped, will the cube grow as a whole or does the tops part spread over the edge and into the rock that its testing on

The Vermatids are messy. They cast out strings to catch things and look ugly
The coral will grow over the edges of the skeleton and down onto the rock. So you'll end up with a lump in the middle
I left mine like that, but wish I had sliced the bottom off, or stuck it into a hole

I have those snails everywhere too. There must be a thousand of them in my 75g. I was hoping there was a wrasse or something that could make himself fat from munching them

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One day I plan on slowly covering the buggers with little blobs of epoxy ...