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RE: Lava rock and filtering
I am using larva rock in the pond filter(200g) and it
works well. In the waterlilies/Lotus containers, I
used nothing but larva rocks.
Robert Nhan.
--- David Lains <david at zfin_org> wrote:
> I would doubt that any anaerobic brake down is
> happening since most red lava
> rock has closed pore structure. The ones on the
> surface provide more
> surface area but rarely are they connected together.
> Think of it as closed
> cell foam, it has more surface are than a solid
> surface but the pores in the
> center are not exposed to the environment. If the
> pores were connected
> through out like open cell foam or calcium based
> Live Rock for a reef so
> that water and nutrients could diffuse through the
> structure an anaerobic
> environment would happen (the open cell reference is
> just for visualizing
> and would most likely not become anaerobic). In the
> deeper pockets of the
> rock it could be happening but I think that enough
> oxygen would move through
> biofilm to exclude an anaerobic and even anoxic
> environment.
>
> David
>
> ><{{{>Does anyone know for a fact that anaerobic
> bacteria living in
> ><{{{>the pores of
> ><{{{>lava rock break down ammonia. I haven't
> really studied it,
> ><{{{>but lava rock
> ><{{{>is rather porous and so it will have a high
> surface to volume
> ><{{{>ratio and
> ><{{{>make a good bacteria bed. Since it would have
> to rely on
> ><{{{>diffusion to
> ><{{{>bring ammonia and oxygen to the bacteria,
> denitrifying would
> ><{{{>be slow, but
> ><{{{>it should be able to take place under aerobic
> conditions there.
> ><{{{>
> ><{{{>---------------
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>
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