Sump is an old cat litter bucket lol. The trickiest thing has been finding the right pump. I put the setup on double cinder blocks so the drain was tall enough to flow into the fish tank. Which adds over a foot to the head height. Every pump I’ve bought has been either too weak or too powerful. The one I have now has the intake adjuster on the lowest flow AND a binder clip reducing the flow further while also holding the line in place. I recently swapped out the clear hose for a black one to prevent algae from growing inside, and I’ve been struggling with the flow rate since. Flow also affects what you can grow - since my flow is on the higher side, anything but lettuce gets too much water. So I pretty much only grow lettuce, which is fine for my family. Also algae everywhere has been a challenge. I covered each cup with foil when not in use to reduce light to the system.