I have several large pure lava rocks in my planted tank and have noticed no
problems.

Ron

"Jim Rea"  wrote in message
news:i_4oa.13410$4P1.1070795{at}news2.telusplanet.net...
>
> "Robert Flory"  wrote in message
> news:u4_na.59$RA6.5983343{at}newssvr15.news.prodigy.com...
> >
> > "CLAIREBARE01"  wrote in message
> > news:20030418124034.18820.00000109{at}mb-m27.aol.com...
> > > hi avisinai!
> > > i don't know if this will help,  but have you heard of the vinegar
test?
> > > if you drip vinegar onto the stones which you want to put in your tank
> and
> > the
> > > vinegar has no reaction then you can use them... if it starts to react
> ie
> > > bubble do NOT use them.
> > > i hope that this might help you even though it only answers half of
your
> > > question!!
> > > love clairebear.
> >
> > Vinegar is a weak acid, anything that fizzes with vinegar probably has
> > carbonates in it and will raise the pH.  That said, it is a very weak
acid
> > and won't get a reaction from a hard dense limestone which would still
> raise
> > the pH.
> >
> > If you can't find some HCl (Hydrochloric or muriatic acid)  .. somewhere
> > around 10 molar is what geologists are supposed to use (10% is close
> enough)
> > try scratching the pebble.  Many dolomites will not react to the acid
test
> > unless you scratch them to produce a bit of powdered rock. Most
pharmacies
> > should to be able to make up a weak HCl solution, or you local high
school
> > chemistry teacher might be willing to help. If you can get it to
scratch,
> > put warm vinegar on the material produced.
> >
> > It comes to mind, you might just fill a bucket with water from you next
> > water change, test the pH, then add the stones, check the pH over a few
> days
> > to see it anything changes significantly.  You might want to do two
> buckets,
> > one without adding stones as a standard just to make sure something
wasn't
> > happening to the water just sitting.
> >
> > Of course, it depends on your fish, some might do better is high pH
water.
> >
> > Bob
>
> What about pure lava rock, will it do anything to the water?
>
>
>
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