I've purchased base rock from Hirocks for fragging - FWIW
, it's very dense (not at all porous) and heavy. I don't think it's *bad*, but I wouldn't use it for all the base rock in my tank.
I've also heard good things about www.reeferrocks.com
(no personal experience).
On a similar note, is there a specific type of LR that we should be putting in our tanks, or does just the porosity matter?
When you say "LR
" - I'm assuming you are including only rock that comes from the ocean? If not, I wouldn't use most "land" rocks, unless you have a source for a type of rock that is porous, and also absolutely free of contamination, and traces of heavy metals. As far as true "LR
" goes - ppl like different kinds for different reasons --
Fiji - heavy coraline encrustation, economical
Marshall Island - Beautiful shapes/formations
Aquacultured - Abundance of life, minimal to zero impact to natural reefs.
There are others, but those are the "big three".