Hi latewood. No I calibrated it just before this res change in fact. I'm extremely careful with that and it was perfect 4.0 and 7.0 when I was done. Plus the plain RO water was dead on 6.0 all night until morning when I nuted.

Could the fact that I used rapid rooters directly in the hydroton make any difference? I never added any water to them from the get go, as they lived up to their name. I've not noticed any material in the res either.

I make a point to shake the bottles well before adding the nutes also, and I add them micro, gro, bloom in that order directly to the res and stir each before the other (plus my water pump in the res stirs constantly and streams into the grow tub).

Since the change and adding the ph up, it's been pretty steady at 5.8. I havent had to readjust it at all.

The plants looked better (and smelled more) this morning. Last night 5 minutes before lights out, I very lightly misted the tops with straight RO water.

What about the old empty milk gallon jugs I use to store water? I rinse them and wash the hell out of them and rinse several more times and let air dry before using them for RO water. Is that a huge issue? I've never seen it mentioned, but trying to cover everything. My filter is close enough to the res where I could actually fill it directly that way, but it'd take several hours.

These issues all started before I started using your formula, so I'm sure it's nothing to do with that. The branch growth is great on these things, especially since they're so squat. Odd though that the shop I got the seeds says this strain likes to grow super tall. I think most of these things have to do with my inexperience with hydro, and starting them with my hard as nails tap water.