Coral? ID Please

[CollinsLL2]

Just wondering what this thing growing on my snail shell is, and how to take care of it if Its something I want in my tank.

out of tank

In tank after first couple days

most recent, it seems to be growing slowly?

any input what this might be is appreciated.

 

[mtfish]

Looks like a Montastraea sp., or star coral.

 

[Salty1962]

I'd leave it on.

 

[CollinsLL2]

thank you for the replies, any tips/links on care? the snail was DoA so the shell is empty, should I secure it to a rock so it stays empty? if so whats good placement for this sort of coral?