Originally posted by: alien42
best base for live plants - about 1/2 inch 100% clay kitty litter with about 1/4 inch layer of play sand on top.
Be careful with the kitty litter. Not all are simple zeolite. The crystal ones are actually silica gel with cobalt chloride treated indicators. Not something one would want IN the water column. However if one was using O3 it would make a good rechargeable dessicator.