Continuing on with my stocktank aquaponics build. Today I finished one of the wicking beds. The bottom layer is lava rock, then 2 inches of perlite & top it off with soil.
The water pipe goes down a drain pipe to the bottom layer. The drain is surrounded by a 1 gallon plastic pot with slits cut in it.
I started sunflower seeds on this, hoping to get some microgreens. I covered the top with plastic to help germinate those.