funny thing is ...im using the same nute mix that i use on the ones in the 2x2 cubes and the 4x4 cubes...so basically your saying i need a lower strength nute solution for bubble buckets than i do for my flood and drain pots and the ones that are in the rock wool cubes that i water by hand...those are all doing great ...i did also place the rock wool cubes the 2x2 ones directly on the floor on the net pot ....and i had the nutes just barely touching the bottom of the net pot so that when the bubbles were on it would splash onto the bottom of the rock wool cube...when i saw some roots i gradually lowered the water level but the rockwool cube seemed to stay satturated with nutrients and very wet....and the plants had also developed the discoloration and sickly appearance.
P.S.
My water ppm is about 26-40 out the tap...im using >1 tps of floranova grow ....2 tps of hygrozyme.....<1/4 tps of root accelerator ...and <1/4 tps of floraliscious plus ...per gallon of 9.0 ph water ....which i have to ph up to 5.8-6.2 using ph using ph up....