Long post, sorry... Second grow here, my ph got up to 6.8, so, I added 4ml of GH brand PH down to my little 4 gallon res. it only had 2 gallons of solution in it. So, I think I screwed it up pretty good. The plant got a little yellow in spots and growth stunted. So, I changed my nute solution as it was due for it anyway. I went from the transition mix ratios ti bloom as it was also due Growth came back quickly and the plant seems ok albeit still yellow in spots. But, the reservoir now has a musty odor and cloudy water. It doesn't get much light in the res, it's capped with holes for the hoses. My air stone is working. But, it's foaming up a tiny bit. EC is 1.69 w/distilled water as base. Should I add hydrogen peroxide or hygrozyme? I've heard peroxide called a bandaid and that once you start you must continue with it. Any advice? Info; Just one plant as the other was male. Rock wool transplanted to hydroton. Drip to drain in a 2x2 tray w 1000w hps. Let me know if I can offer any more info to improve advice. Thanks in advance. You guys always help me out quite well. Sorry for typos. Posting from phone.