I think you have another problem, you have a 30cm fish in a 130L tank, this
tank is WAY too small for the oscar

"Robert Flory"  wrote in message
news:ghFoa.358$rj7.341{at}newssvr16.news.prodigy.com...
> "Avishai H. Kolatkar" 
wrote in message
> news:b7tnac$eh8$1{at}news2.netvision.net.il...
> > I think PH level not only the factor that affects the fish. Some stones
> also
> > has metal substances. Sometimes iron or copper or anyother. These things
> > also affect fishes in the negative way. Isn't there a 100% solution for
> > checking a stone if it is pure for aquarium? I keep 30 cms oscar fish in
> 130
> > litres tank.
> >
> Yep...use only quartz sand or pebbles, unless you've got a marine tank.
> Quartz is easily identified and is really pretty insoluble at surface
> temperature and pressures.  Actually I suspect that few if any stones
found
> in a river would give problems.  Anything hard and smooth probably is
pretty
> insoluble, it would be rare to fine such stones that would leach mercury,
> selenium (except down the road from where I live) arsenic and that sort of
> thing unless you are in a heavily mineralized area ...read that mining
> area...   and most of us would know that.  Granted a lot of stones might
> leach material into the tank at a PPM or PPB levels, but water changes
would
> probably keep the levels at or near non detectable.
>
> The most likely problem would be with sedimentary rocks like I like to
haul
> back from the beach.  One particular type is an algae magnet.
>
> You could to chemical analyses of metals and other stuff, but total metals
> and the line are usually done by dissolving the sediment in something like
> nitric acid.  More reasonable tests involve one of several test using
citric
> acid or the like which give fast results that more closely reflect what
will
> dissolve in water.  They all have one thing in common... they are
expensive.
>
> So unless you are dealing with something relatively soft, like gypsum,
> anhydrite, limestone and dolomite, most things won't cause you much
trouble.
>
> If anyone has examples of putting a stone (after being boiled) into an
> aquarium and poisoning a fish let us know.
>
>
>
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