Do some reserch on Dwc or watever hydro ur doing. u need to put down what are u doing and what r u putting. have the water to 68*.... put two smaller air stones, the big ones dont give off moreoxygen. buy a TDS pen to measure the ppm. give it RO water....change reservoir every week.. most important a ph of 5.8.6.0. make sure to look into this