ST with its high nitrogen shouldn't be used in bloom at all.

I keep my ph (hydro) between 5.5-6.2 and have never had a problem. But Dai is correct that 6.7 is way too high.

Is your ppms on 500 or 700 conversion? I would drop the number to 1000ppm if using 700 or 800ppm if using 500 conversion......just add water and make sure to adjust ph AFTER adding anything.

I don't use CO2 so have no idea if using it on sick and/or stressed out plants is a good idea or not.

If you aren't using a Zyme product i would start.....asap.



I have no idea