Anyone Tried Lava Rock in a Tank?

On 2004-10-10, ManWorld42 wrote:
I was looking at some at my local Home Depot. The rocks seem very
porous and probably can support quite a good bio filter. Anyone with
experience with these rocks instead of gravel?

For one of my tanks, I dug some lava rock out of my mom's garden, washed
it off and plunked em in. One of the pieces is in the new tank I setup
recently. It's nice looking! I suspect that it might have contributed
some of extremely high water hardness in a tank, but I also had Seachem
Onyx substrate in there, so hard to tell.

My rocks don't have sharp endges - they'd been out as a border for my
mom's garden for a few years and had been worn pretty smooth by weather.


--
Ross Vandegrift


"The good Christian should beware of mathematicians, and all those who
make empty prophecies. The danger already exists that the mathematicians
have made a covenant with the devil to darken the spirit and to confine
man in the bonds of Hell."
--St. Augustine, De Genesi ad Litteram, Book II, xviii, 37