Morning
@InTheShed - a little ways back you asked me about what worked in the aqua setup? (paraphrasing). I was thinking about that and found this picture. This was the most successful setup and one I’d use again. That’s a five gallon AirPot rolled into about a 2 1/2. The outcroppings on the pot made it an easy insert for the lid of a five gallon bucket, both for support and to keep it even. Obviously AirPot is good for the upper pot to max root development relative to speed. Get down to the bucket girl! Then the two rows of holes under the lid was my air/perlite space and I dropped it onto the lower res when I saw roots on the bottom. This one was the right size upper pot and the right way to have the little air gap which gets the bubbles from the air stone and entices the roots down. For what it’s worth!
Edit: also, if/when you fill the five gallon bucket with roots and decide to move to a larger res (as I did with that Watermelon Wedding Cake shown here) you simply cut the hole in the new res and sit this setup as shown on top. Easy as hell and you already then get the nice buffer with the lid.