I am using the cheap nutrients Maxi-Bloom at 1 tps. per gal in 3 gal. res. I put one cap full of superthrive in the res. every two weeks. I also use CO2 tablets from the pet store 1/2 tablet once a week. 3LX1WX3H cabnet two 125w flors one 2700 one 5600. One 250hps sitting right on top of unit about 12" from the top of the shortest plant and only 5" from the tallest. Shortest plant is the one that is very yellow and droopy