No driftwood or lava rock, you have to be carefull which non-reef rock you put it, some contain too many metals and other bad stuff that will leech into your tank.

If they are talking about dry aragonite/calcite rock, you can put it in.

I bet ya it's tufa...

Bought some from riverfront, they called it travistine (not sure if thats how to spell it)

M

Travertine maybe?

Yeah thats it. I'ts just white colored porous looking rock. I bought maybe 5 or 6 pounds and the rest of my tank will be made up of LR.

Do you have any pics?

The wikipedia image doesn't look very porous.

http://en.wikipedia.org/wiki/Travertine

rory read the rest of the info in that link........ it states that it is quite porus....... there must be different types of this rock cause it calles it a different name (the porus stuff)..... but i agree the pic doesnot look porus at all......

mikep you could also order some dry reef rock as well it will reseed and become live once again....... free bump for "The ReefGeek"

Travertine is a compact calcium carbonate used as a facing material in construction.

Stucco! :)

That is backed up by this wetwebmedia post too

http://www.wetwebmedia.com/refugdsbfaqs.htm