I think it's okay to give your pH a little play room as long as you are checking it regularly. A small drift is completely natural. Think about a plant growing in the ground. There is no way that plant is being kept at the "correct" pH yet she's still going to thrive if taken care of. You can't attribute "an increase in crystals" to a pH change of .3 over only a couple of days. She is growing, of course she'll fatten up as she ages and will pack on the most weight in the last couple of weeks.

I guess the point I'm trying to make is... if your plants look happy, healthy, and perky don't be so quick to nitpick your pH.
lemonboy Reviewed by lemonboy on . which pH chart is right? What is the best pH for hydro for MJ during flowering?? On the internet you can find charts showing nutrient absorption through the pH range. But theyâ??re all freaking different! And directly conflicting. See below: 1) A chart from www.overgrow.com (guess they should know about pH for MJâ?¦) 2) A more commonly seen chart, taken from an orchid-growing website (this chart is the same as one thatâ??s sold in grow shops around here) 3) From an avocado growing website 4) From the Rating: 5