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Brownish/blackish/purplish color on fan leaves

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Hello! Pretty much first time grower, had a series of events that started this grow journey off. About a year and a half ago I got a Viparspectra xs1500 Pro light as a barter for helping someone out. We thought we might use it for some of the vegetables or fruits we grow, but it had sat dormant until about a month ago when I stopped by a random dispo for flower and they had two clones that had been there for “quite some time”. They are “The Ruckus” and “Blueberry Banana Muffin” strains from Bald Peak here in the PNW. They were tall and had very little growth, and he sold them both for $20ish. I brought them home and crafted a tent out of an old box for a TV and let them vegetate for a couple weeks, then nearly 3 weeks ago I switched them to 12/12. They instantly outgrew the box and I had to buy a $40 2’x4’x6’ tent to future proof myself in case I decided to go bigger next round.

They are in a perlite soil mix I got from a nursery, are on 12/12 with 75% light, get fed PH’d water with a “bloom” mixture about every other day, have 1 gallon pots( I know kinda small), have a 4” exhaust fan on 14 hours a day, and 2 small fans 24/7, and have seemed really heathy until the BBBM started to get a dark coloring to the leaves. What could it be? Also, are the daily rh and temp changes ok? Attached are images of said problem, and charts/graphs for humidity and temp.

tldr: 3 weeks into flowering indoor soil plants leaves on one plant changing.
thanks for having me!
edit to add: I added a 50w equivalent light for the sides and have done zero lst except defoliation during the first week of flower
 

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I'm thinking genetics, but keep an eye on her and keep us posted, some genetics get a little wild looking
 

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I was thinking that might be part of it. The plant otherwise seems to be doing wonderfully, drinks water, runoff is perfect PH, always has airflow, etc.
What do you make of the swinging of temps, humidity, and VPD?
 
Heard that, just being a first time parent to these little beauties has me all wound up over every little thing that even semi-remarkable, lol.
 
That was definitely my first move, just not a lot that were very similar. I’m thinking now that it might be the nighttime cool down that’s causing it, in conjunction with a possible genetic factor.
 
What is your PH? What is the temp and RH swing you have mentioned? How much of a swing? If your dark time temps are on the low side you can get some coloring on your flowers. Think fall foliage.
 
It’s about 6.5 in and nearly the same on run off. The RH swings from 40-high 50’s day to night, and the temp goes from high 60’s to 80ish.
 
Well...with the PH in range I'd guess the coloration is caused by the swing in temps, stage of growth, and/or genetics.
 
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