its about 2 foot in diameter but its almost round

Ray, is your lava rock sometimes called feather rock??

---------- Post added at 09:21 PM ---------- Previous post was at 08:35 PM ----------

anyone ever try Coral? I googled but cannot find very many people who have tried.

I have no idea.

Coral is almost entirely calcium carbonate. Probably not a good substrate.

Ive gathered up a few stones to on a couple flasks of phal pulcherima to experiement with.
ill post some pictures when i do

Decided to try mounting a flask of Phalaenopsis pulcherrima on lava rock and on coral. They are both sitting in a tray of water.

http://this-side-of-paradise.com/wp-...914-Medium.jpg

http://this-side-of-paradise.com/wp-...944-Medium.jpg

I hope you will post pictures periodically so we can watch everything grow. Good luck with both set ups!

Yes, please do.