I checked the PH and it's @ 7.8. From what I'm reading that might be the problem. I have "PH Down" (sodium Bisulphate) for my hot tub. Can I use it to lower the PH in the water & Nutes mix I'm giving them? I'm using ferti-lome 23-18-16 for my bloom Nute. Is thet too much Nitro?