I feel like im in week 3-4 of flowering (switching to 12/12) ?? Ive been slowly giving it nutes without ever checking PH, I clean it once a week and add fresh water that has sat a day. am i looking good or what.. i got a 2x 50 w lights, a 75 w light and a 150 HPS hanging above. should i only use the hps during flower or is it cool if i combine it