Round Grey Airstone size:8" Either split between or from

Either split between or from a single socket

Monopotassium Phosphate

All the primary

when watering plants the Vermiculite will stop the potting mix from drying out and as Vermiculite has high cation exchange

If you are following the Green Planet schedule

Round Grey Airstone size:8" Either split between or fromRound Grey Air Stone works with an air pump to create bubbles which add oxygen into the water of aquariums and hydroponic growing systems. The larger the surface area of the air stone, the greater number of bubbles, therefore providing fish and plants greater levels of oxygen in aquariums. Available in 6" or 8"