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Thanks. I do have some H2O2 I can mix if needed. Just hope this thing won't kill the plant. Btw, that "plug" stuff around the stem is rapid rooter. There is no soil in the system, not sure if that makes a difference in the diagnosis though.

Hi, I started tie-down last week (used thick cotton twine). About 3 days ago I noticed this "damage" at the bottom of the stem. The location seems close to where the string was (I moved it a few mm upward after 24 hours for better stabilization of the stem). So far plant seems growing fine. I...

I think PH didn't change, not beyond +/- 0.2. PPM went up to 650. I am going to do a complete change tomorrow when I get Cal-Mg as you suggested, will also lower starting PPM to 500 as 600 seems too high. Thanks!

Yes, I added more bloom and then replaced 20% of the solution with water. My pen was calibrated about 6 days ago. I only started a few days ago adding hydroguard beside micro, gro, bloom. I don't have calmag. My tap water is 200ppm. Should I be using tap water instead of RO?

Thanks guys. I used RO water, then added Flora micro, gro, bloom. I was trying to follow the 1:1:0.5 ratio among the three. I checked PH after mix, and before use, I also checked ph every day or so. Flora bloom has the most potassium, maybe I didn't add enough of it, I will add more today and...

Auto, week 2 veg, DWC, flora series nut, 600ppm, ph=5.7, 100wLED (20in distance), RH=30-40, T=20-28C (70-82F). Any idea what I can do to fix this? Thanks!