myketbanswered grow question 3 years ago Thank you. Other than the day that I gave them nutrients, I have been misting the clones' soil with pH 6.5 water. Last week I fed a little (5ml) of Fox Farm nutrients at light dose of pH 6.5 and 450 ppm.
Per your comment, I checked the runoff. For both cups, runoff pH is 5.8 and 800 ppm. Surprisingly quite high as it is just peat moss and perlite and I only fed them once.
Not sure why runoff's TDS increased so much and pH is so low. So this evening I flushed it with pH 6.5 water and brought runoff's TDS down to about 300 ppm and got the pH to about 6.0.