Hi, I’m running this ICC x Dosido and the top leaves have started do this? I’ve got a few ideas but does anyone else have any suggestions
Water PH is 6.9 and she is in peat (40%), worm castings (30%), rice hulls + perlite (30%) with Gaia greens dry amendments and some microbes.
I don’t claim to know anything. But how are you lights out temps? They get 70F or below?
They can get down to 68 or so.
My plants usually have a 80F or so lights on to a 68-70F lights off and later in flower they’ll usually start to do that as well. But again, I’m just anecdoting, hopefully someone else can chime in for ya 
I’ve seen that in later flower from some strains. Usually it’s just the fade as they ripen. Cooler temps at night can make it spread as far as the purple color. The only time it was an issue for me was when it came early and I think it was light stress that caused it for me that time.
Yeah I thought maybe colour change but I’ve seen a lot of purple but never like this, usually it creeps at Ross the leaf evenly.
Light stress was on my list of culprits. She stretched a bunch and I cannot go any higher with the light. It’s 12” away and 450w @ 80% so 360w, week 3 of flower. I’ll turn the light down and see if that makes a difference.
If it’s happening that early in flower the light levels are where I’d be looking. Do you have a meter to check ppfd? A cheap LUX meter has been one of the best equipment buys I’ve made. It really helps me get the canopy at the right ppfd. Hope you get it sorted quickly.
I’d raise the lamp to double that height and turn it up to spread the light over the canopy. At week three they should still be getting some N too.
Could be from high light, kinda like a sunburn, but anthocyanins are most commonly displayed in pH neutral rhizosphere. If you have cool nights this could likely be your source. Looks good to me. I’d back the ligh off just a tad and see if it diminishes. 
LEDs will bring the purple like that with high intensity in flower. Here’s a photo of mine, also in dry organic ammendmended soil, looking very similar. Further into flower than yours though I’d say. Only the parts getting the highest intensity show the purple.
This looks so similar to mine, it must be the same issue. Did you move your lights? Did it recover afterwards?
I mean, I don’t think the plant was suffering in any way. That’s just what happens in that environment. I didn’t raise the light and I let it grow until harvest. Came out top notch.
Looks a lot to me like good ole flower fade with a combo of colder night temps, I don’t see an issue here aside from ur prob a month or so away from a nice frosty harvest
