Back when I was using RW cubes and blocks I watered mine 5 times a day at 15 mins each. You could prob start at 4 and see how things go as to many variables to list. Guessing at their age by looks I would say not over 800. That yellowing really looks like a PH issue. Next time it floods lift liner up some to verify those 2 buckets are in fact flooding and not a clogged line from roots, etc. When you go to put liner back down in bucket do it CARFULLY and SLOWLY or you will have wet feet :whalephant: