I once used red lava rock in a cichlid tank. I had a constant problem with phosphates which translates into algae, algae, algae. I no longer use it. Since my pH was already around 8...
cheers,
Bill
> George &melanie Caruso wrote:
> >
> > After seeing so much discussion on the use of Lava Rock in
> filters
> > well water in my tanks. I found that after two days of
> running a small
> > box filter with lava rock and filter floss in the tanks there was a
> > considerable rise in ph. From 7.0 to 7.6 or higher. Has