Is that the soil PH or the waters PH? Soil can act as a buffer and change your waters PH. Try watering with your pot in a bucket then check the PH of the water coming out into the bucket do not flood the pot just give it enough so some runs out the bottom.

Herbus
Herbus Reviewed by Herbus on . Necrotic spots, stunted growth. 15 day old seedlings still working on the first set of 3 leaves. Since the first bladed leafs came out there have been necrotic (dark blue almost purple) spots on the leaves beggining with the outside. The growth has obviously been stunted to an almost complete stop. I have proper lighting, temp, and watering techniques. The thing I believe it might be is the soil I use. It is the same soil I used on a last grow, but it has been outside for a while and I believe maybe it dried out too much. Rating: 5