Do you have an idea where your PH is? either strips or a meter... an out of balance PH can prevent the plants from absorbing certain elements. Might be something to check on?

I checked pH last night and it is low - 5.0. I don't have any "pH up". Is there any other way to raise pH? I know it is easier to lower pH than to raise it!

Thanks,
Beth

Baking powder. Try 1/4 teaspoon per gallon of water to start. Then test again. It is how I raise my ph. Though I'm just a beginner so take my info with caution.

My nutrient self buffers, but if I were to need to adjust the pH, although I have a couple tubs of pH up and down, I'd prefer to use baking SODA (the stuff in the yellow box) and either acetic (vinegar) or (lemon juice) acid.

Just a hint: pull off some nutrient and do a "test" batch before you wind up ruining all your nutrient and have to start all over again.