Week 9, purpling, curling leaves

[ElGuaposBlueberries]

Hey all,
I'm continuing to have this issue with my girls, not sure what is causing it and looking for some guidance on how to stop it or how to keep it from happening in future runs. Frankly this hasn't happened under previous lights but I'm not sure if that is the issue or not.

Running a 350 Diablo HLG in a 3x3x6 tent at max height (26 or so inches above tops).
78degrees F and around 55% humidity. this is up from a few weeks ago where my humidity was around 35%.
I did some tweaking on this after I saw a VPD chart (thanks previous helpers!).

Soil is BAS 3.0.
Been watering every 2 days with tap water and Aloe Vera and Fish Shit. My PH is always right around 6.2.
Last week I added .5tsp of Mega Crop's Sweet Candy to 1gal during feeding, but that was the first time I've added anything (BAS 3 supposed to have everything in it)
Purpling was occurring a little before this particular feeding.

Running about 1153 mols from the light.

Strain: White Cheese Auto from Sumo Seeds. 9 weeks into the grow.

Any thoughts on what could be causing this? Is it just "time"? Or am I out of whack somewhere?
Many thanks Heads, Cheers!
El Guapo

 

[ElGuaposBlueberries]

After a fair ammt of research it looks like this could be a phosphorus deficiency - I have a hard time believing I have an overabundance of iron, but would potential presence in the tap water possibly cause the plants to get this far out of balance?

 

[Suki]

This looks like pretty normal fade to me, what are your night time temps? I definitely would not assume nutrient issue from your picture.

 

[bullmark]

i don’t see a lot to be concerned over. The purpling is likely genetic, unless your temps have dipped very low and been erratic….either way the result of simply purple leaves. The health of the leaves is what’s important and they look fine at first glance.
I run a HLG 320 and my plants have done better at slightly lower intensity levels. That could be the reason for the minor curling down on the edges.
I’m not familiar w/ the soil, so unsure how far it’s supposed to carry the grow. Tread lightly w/ outside nutes and let the plant tell u what it needs.

 

[Suki]

Also, what time of day did you take the pic? I pretty much ignore any droop within a few hours of lights out as by late the next morning they are typically back to normal.