Join Date: Jan 2013
Location: The Boonies, Arizona
One of my tanks has flourite mixed with the soil, and the other has plain Hartz pH 7 clay kitty litter (non-clumping, non-scented) in the soil. But, as far as I know, the purpose of these (or any clay mixed with soil) is to provide CEC (cation exchange capacity). The clay is able to store the nutrients that are being released by the decomposing soil, thereby keeping those nutrients within the soil and available to plant roots. As a bonus, the CEC of clay keeps those nutrients from being released into the water column.
EDIT: Even with these additions, I still get bubbles. But not the bad bubbles.
EDIT #2: Not sure if Gallium mentioned this, but a good rule to follow to avoid the formation of anaerobic pockets is to make sure that the soil layer is only 1-1 1/2 inches deep. Too deep substrate is said to be a cause of anaerobic pockets.
I'm wondering how clay or an inert substance like sand would help avoid anaerobic pockets?
"People have forgotten this truth," the fox said. "But you mustn't forget it. You become responsible forever for what you've tamed."
-Antoine de Saint-Exupery
Last edited by Nicci Lu; 06-10-2013 at 01:24 AM.