Soil grow:
Plant B2:
Woke up today and observed the center of the top leaves turning slightly yellow. Didn't look like nute burn, water issues, etc, so I checked ph run off. Water going in was 6.75, my ph strips go down to 5.0, the water coming out was lighter then my strip! So I flushed with 7.25-7.5 water four times. The last ph reading out was 5.5. After the flush I airated the soil with a chop stick by pokin holes in the soil and "fluffing" it up. Plant was then placed back in veg.

Any help/information/suggestions would be appreciated!