Hey, I don't mind tilting my ph if you don't mind that I keep forgetting you're a hempy grow! LOL! aHave you ever grown in soil? I don't care for hydro, the water chem changes can come on so fast that it can shock the hell out of your plants. Soil is more forgiving & if it fluctuates, it does it slowly. I'm an organics kinda gal myself. But when I had a hydro unit, I found that the recomended dose (nutes) usually burned my grow & I had to adjust the pH like every other day. The expense of it was getting way out of hand & then one night while I was sleeping, a coupling came loose & when the pump came on it flooded the room instead of the plants. So I awoke to a flooded mess & dried out dead plants. I was so pissed I kicked the whole damned thing out the window. Would have been nice if I opened the damned window first, just added to the expense! That was in the mid 1980's. Swore off hydro & haven't regretted it. Now I use milled spaghnum moss (fine grade peat moss), perlite & mix in some really great organics. Its pretty darned stable, hardly ever fluctuates, pH NEVER goes up, sometimes down, but then it gets a little wood ash in the water & its fine.
--- For your pics. Landscape mode is horizontal, portrait mode vertical. Somewhere in settings, you should be able to change it up.
--- Your plants are looking good. Something must have fluctuated pretty fast to have the leaf edges curl under, but it doesn't seem to have effected bud or bud leaf, so I wouldn't worry, just dilute your nutes a little more. Maybe your pH jumped up a little fast. Plants can take a slow change, its that RAPID jump that shocks them. Another reason I prefer soil to hydro... But, to answer your concerns, check you water/nutes, get them back in ballance & everything should work itself out. Since I gave up hydro a long time back, I wouldn't know what test kits are available now, but if you need that advice, one of the guys should be able to recommend something. ~~~PEACE!~~~