Dutch bucket, hempy bucket, bato bucket, etc etc...
Conventional medium is perlite/vermiculate. Recent trend has seen some growers go coco above the dutch hole, and perlite below. For those that have tried both, what is best? And why?
If you're set on going hydro, then I strongly suggest you consider NFT. In your space, you could fit a couple of 2 x 6 or 8' trays and grow mega-crops. Look at @hydrohippy_1 diaries:
growdiaries.com/grower/hydrohippy-1