I'm using ebb and grow with hydroton and 3 part GH nute feeding. The setting water at the bottom is a major design flaw so raising them is a good idea. I did that and also modified the hose system by installing a 2' PVC main pipe from the controller bucket that T's off in the middle of the room and extends to both walls. The feeder hoses come out of the main pipe every 14" or so and are connected to 4 and 5 buckets each. It's easier to offset the plant spacing and the system fills and drains much more efficiently. Originally my room of 90 would take almost 30 minutes to fill completely and now it fills in about 10 and all of the buckets fill at the same rate instead of the staggered rate of the "daisy chain" hose set up. It has also virtually eliminated the clogging that can happen from gunk buildup when all of the feed water has to travel solely through the small diameter daisy chain hoses.