Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
Yes, you can break the tabs up if you feel that's appropriate given the location and amount of your plantings.
- Put them approx. 1" below the sand surface near the root system of plant(s).
- The tabs have no effect on the development of anaerobic gas pockets - only the sand does, if it's layered deeply (3" or more) and heavily compacted so that it gets little or no oxygen. Play sands are notorious for this, as they are very fine grained.
- Whatever sand you have don't layer it more than 2" or so to minimize the risk of gas pockets developing.
- If the tabs get exposed to the water column there is no harmful effect, but if they have begun to crumble & disintegrate, you will have discolored water/cloudiness from it.