"Graham Broadbridge" graham at peachy dot org wrote in message
u...
"Racf" wrote in message
...

I thought I remembered this.....and I tripped over a possibility.
It
really has to do with your dissolved C02 levels in your tank and how
it
behaves with CaCO3 (Calcium Carbonate). To make a long guess
short.......If your dosing right after a water change...if your CO2
level drops CaCO3 will/could come out of solution and manifest
itself as
milky white pooh until it can dissolved back into solution....which
can
be a little while. Does your change water contain elevated amounts
of
dissolved CO2? Mine does here in MN....

That's a very interesting train of thought.

My tank has quite high disolved CO2 (around 25ppm due to injection)
whereas
the tap water is very low (around 3ppm).

I normally balance alkalinity between new/tank water, but the disolved
CO2
will be quite different. Not enough to cause much of a hiccup with
the pH
due to the dilution and effect of the CO2 controller, but possibly
enough to
give rise to a chemical reaction causing the tank to cloud for a
while.

Thanks for the post. Experimentation to follow :-)


Graham.




There are some interesting articles in the APD archives...You can google
into it very quickly.