Just some advise. I tried many different ways to grow and the bubble buckets and the aero setups /w the clay is a pita if your not spot on with nutes. IMO I believe you have a nute problem. Best thing to do is change the resivior(new nutes 1/2 strength). I like big resiviors. This helps with plants not making sudden changes... With 1/2 strength nutes you can always kick it up if they are growing slowly. As the plant uses the nutes and evap happens your nute solution will get stronger (not good if your dosing full strength on mfg lable). Also topping the resivior with fresh ro is very important.The #1 reason i don't like these setups is you have to contantly check these till you get spot on. I would advise a larger resivior cause its easier to keep the nutes at the right level for longer than 2-3 days. I would get away from the buckes and go to cocomix just my opinion. Good Luck.