IMO ditch those funky air pots and save yourself some time. They are messy and end up evaporating your water too quickly. After trying just about everything in the book, I've found the best pot to be the 2-gallon white paint pail from Home Depot. The white pails work great for reflecting light in your grow area and they also discourage root-wrapping since they see a bit of light when reaching the edge of the pail.
Make these hempy-style by drilling a 1 inch hole so that the bottom of the hole is exactly 2 inches from the bottom of the pail. Then silicone glue a 2"-square of fiberglass screen ($4 at home depot for a huge roll) over the hole, and you're done.
Fill the bottom of these pails up to ~3 inches (just enough to cover the hempy hole) with Grodan croutons, then 100 percent coco from there up. The Grodan cube resi allows the roots to really go apeshit, whereas the hydroton is too hard to really let them thrive down there. I've tried both side-by-side and the hydroton is no bueno. If you can't get croutons, you can always dice up some of the bigger blocks with a good knife.
2 of these buckets under your custom panel would certainly have you stoked! I only need to water mine every 2-3 days.
I've used those white buckets and got quite a bit of algea growth in the res, so I ditched them for the black buckets
Perhaps just black out the bottom where the res is?
You got a link to those croutons you recommended?