Need help with yellowing leaves please..

Hi everyone,
New to this site and I'm a first time grower. My plants are now in the beginning vegetative phase. I'm growing in a 2'x4' mylar tent. I have 3 plants. 1 Mixed Berry, 1 Dark Star and a 1Secret #28.. The first 2 are strong plants, the Secret 28 started slow but it's coming on now (abt 1/3 of the size of the others). I'm using "Purple Cow Indicanja" living soil in 3 gallon cloth pots. My soil ph is 7.0 (which doesn't seem to drop even using acidic water). I'm using tap water with adjusted ph. They seem to need water abt every other day. I'm letting them dry to 1st knuckle deep before watering. Temperature in the bottom of the tent is 73.6 at plant height 75.3.. Humidity is 61%-65%. I've Installed a fan with filter for CO2 delivery and cutting the smell. I also have a small fan oscillating on plants to create a breeze like environment. I started the tent with a 4000 watt LED full spectrum light but when my problem began I thought perhaps I was burning the plants with the wattage and speeding up nutrient intake. After some research I see that I can pass with 250 watt of LED. Plants aren't growing as fast since downgrading the light. As of now, I'm continuing with the 250 watt full spectrum LED lighting and am not adding any additional nutrients (although I do have them). However, the problem persists. I'm attaching a couple of pics to see if anyone might know what's happening. I'm desperate to get this under control so I don't ruin them before I even get started. You can see it begins at the edges and spreads thoughout the leaf until mostly yellow with green veins. Any suggestions? I look forward to any and all suggestions! If there's anything I haven't included please ask. Hopefully I'll have the answer.

Thanks so much for your help!

Almost looks like Boron Deficiency, haven't seen that one in awhile.

What ph is your water? I see you said acid..

I'm running 5.8 ph water.

Plutonium said:

Almost looks like Boron Deficiency, haven't seen that one in awhile.

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I'm using purple Cow Indicanja living soil. Is it possible to have a boron deficiency in live soil? It looks like so many different things. I'm just lost in trying to figure it out.

The only thing id recommend is let your ph swing ever so slightly higher. There’s the potential that if you are deficient and you’re steady at 5.8 you could be locked out. Something i tend to do with my hydro grows, slight swing to efficiently uptake all micro nutes. Otherwise looking healthy, maybe don’t do anything drastic.

I assume you’re getting the 7.0 reading because your using one of those soil ph probes? Ditch that and get a proper soil testing kit to really understand where you’re at, then adjust from there.

burner686 said:

The only thing id recommend is let your ph swing ever so slightly higher. There’s the potential that if you are deficient and you’re steady at 5.8 you could be locked out. Something i tend to do with my hydro grows, slight swing to efficiently uptake all micro nutes. Otherwise looking healthy, maybe don’t do anything drastic.

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So go like a 6.0 ph? What do you mean by locked out?

HumbleTie1321 said:

So go like a 6.0 ph? What do you mean by locked out?

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Nutrients require specific ph ranges to be utilized. If your ph is to low/high your locking out those nutrients from being utilized

burner686 said:

I assume you’re getting the 7.0 reading because your using one of those soil ph probes? Ditch that and get a proper soil testing kit to really understand where you’re at, then adjust from there.

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You guessed it. Definitely not accurate. I have a great one for water. Do you suggest strips or the liquid drop style?

Dreypa said:

Nutrients require specific ph ranges to be utilized. If your ph is to low/high your locking out those nutrients from being utilized
View attachment 4953447

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I see. That makes sense now. If the ph is off how do I adjust it? Adjusting the ph of my water doesn't even seem to do it. Could the soil be locked in at 7?

Your soil definitely is not locked at 7, at least highly unlikely unless your watering/feeding at ph 7.0 constantly. You’re doing a good thing by running living soil, it’s great stuff. Keep in mind there is a large buffer for ph when growing in soil opposed to hydroponic, so you have that on your side. Id get the dye style kit over a litmus paper style, those are next to useless. Just try mixing your next water/feed at say 6.0 I wouldn’t be too worried yet, keep monitoring your newest growth for signs of deficiency.

You did say soil grow....
A word, if I might...
Be cautious adjusting the PH of water for soil grows.
A soil environment manages it's own ph with the presence of bacteria and fungus.
The chemical you are using to adjust the ph will linger and build up in your soil.
I suspect you are seeing the result of a rich and uncomposted soil mixture, combined with an unbalanced soil food web.

I looked up the soil you are using and reviews seem positive, however I wonder if the bag you received was fresh.
A plastic bag is, by definition, an anaerobic environment.
When soil mixes sit in the bag too long, or in the sunlight, they can switch from an aerobic environment, hosting all the soil lovelies, to an anaerobic environment, full of rapacious little scavengers.
AN alternate possibility is it is simply very fresh and not quite finished composting.

It's a tough situation.
When damage is seen, processes are in action that are hard to predict.
A nice balanced tea could help swing things in your favor in a gentle way so you don't end up paying for too much meddling later.

Unless your water is WAY out of range, I wouldn't add Up or Down.
Make the soil healthy and it will do the job better than you can.

Just my 2 cents worth.
I am not judging other advice you may get.

The soil you are using appears to be designed to run start to finish without adding nutrients to it. The only other question would be what are you watering with? City water, well, or reverse osmosis water? There is the possibility as well that with an intense enough light you may need to supplement with cal mag.

As was previously mentioned don't adjust the PH. That is probably what is helping cause what looks like a magnesium and phosphorus deficiency.
I wouldn't do anything to correct it except for raising the temperature to about 83-84f with the lights on and 73-80 lights off.

Soil sounds made for cannabis so you shouldn’t chase the pH. Its on the edges, nutes burn the tips. Probably just a little wet.