5th Week Flowering Leaves turning Yellow

So today I am 1 day shy of my 5th week of flowering some Jack Flash #5 as described in my grow log in my sig and since 1.5 weeks ago my leaves have begun to decrease in their greenness. I am kind of worried because it started only 3.5 weeks into flowering and I changed the reservoir on the the 8th of may so about a week and half ago and it got a little better for like 3 days then it started to get worse and there is more yellowing happening at the top of the canopy now. I have 2 plants and it is happening pretty uniformly. Around week 3 of flowering I had about 950 PPMs or so and when I changed the res I bumped it up to about 1100ppm. pH= 5.7 Feeding lucas formula with flora blend, Pro Silicate, Koolbloom and floralicious.These babies still have about 4-5 weeks left and im worried cuz the yellowing is happening really soon and at this pace it will be really yellow if not dead by week 9. Any ideas about whats happening? Am I underfeeding? The pics seem to show it slightly but it looks worse in person. I had to do a little photoshop to get the right exposure/ better colors. Any suggestions or is this perfectly normal?

they look gud. i wouldnt worry about the color too much.

did it start when you jumped up to 1100 ppms?

No it started 3.5 weeks into flowering, so relatively early and I had them at about 950 ppms without the kool bloom.

im in soil and mine do that sumtimes around week 4. usually when im feeding heavy and dont give it a flush. in the end everything works out for me. still pull a pound a light and still is kill.

I have been flushing between res changes too, especially when transitioning into flowering. When I say flushing I dont mean feeding them just water I mean just rinsing out the pots with RO water a few times to remove salts. So I don't think its nutrient lock out, if that's what your thinking. Thanks tho

no i dont think its lock out. i use RO as well. mine never lock out just sumtimes they yellow off early like your pic. if you find out wat it is hollar

You have a N def normal during flower but yours are a bit more yellow than we like and its because your bloom you are using has none in it. I assume you have some GRow that you used to veg right? Add just about a 1/4 of your total amount of bloom you use with grow for the next change out. You use 1 cup you use 3/4 cup of bloom and 1/4 cup of grow. Make a foliar spray with the grow 1/8 teaspoon per quart and spray it daily with lights on. That will take care of your problem.

Im using straight lucas formula at about 1000ppm so it does have some N in it. I need to change the reservoir too should I up the PPMs? Can I foliar feed with GH FloraMicro or can u recommend something? Im debating whether it would be a good idea to foliar feed since im so far into flowering at this point, any suggestions?

You could do all of them and the foliar feeding would be up to you. Like we said you have normal yellowing so your not in any danger of jacking up your plant.

1/8 teaspoon per quart

Too many bloom enhancers, not enough base lucas formula = nitrogen deficiency. Early enough to correct it though, back off on the additives and increase micro & bloom. Lucas formula works. Everyone falls for the additive hype! Good luck!

Have you added anything to your grow room lately? I started getting signs of mg deficiency, salt/heat/nute burn in my 3rd week of flowering. I say all of these because I'm still not sure what it is as I feed quite weakly (60% strength - Dyna Grow Nutes), I do flush my medium (rockwool) every 2 weeks and temperatures are relatively good @ low 80s and high 70s.

For me I experienced a period of slow decline shortly after introducing a few new elements into my grow room: 1) Small shelving unit, 2) Small cardboard box, and 3) 2 one-liter bottles of diy co2 yeast/sugar/water. After reading and seeing pictures of off-gassing I tend to think that my problem might be from off-gassing and now I'm unsure what to do. I've removed the shelving unit and the cardboard box since and I've been carefully photographing a series of leaves every day to see if conditions improve after the removal of these items. Of course I've also been sure to monitor my feeding solution as well as run-off from feedings to maintain a proper ppm rates.

Old thread but I think ur ph was too low...at 5.7 it can't take in calcium and stuff...just saying lol