Cal Mag Deficiency?

[looneyandtunes]

This is my first grow. Halfway through week 4.
1 Super Skunk- Doing fine after recent topping.
3 Amnesia Haze with what appears to be Cal Mag deficiency.
Seedlings were popped into OF after germination in paper towels. 5 gal smart pots.
RO watering every 3rd day with approx. 20% runoff.
Nutes given so far:

1/4 dose of Botanic Care Cal Mag Plus given for last 2 waterings and full dose given yesterday. (1st dose of Cal Mag started at 28 days after sprouting)
2- 1/4 doses of AN Sensi Grow given so far.
Upper left- Super Skunk- doing fine with same soil/feedings except.
Soil PH is 6.2-6.5
Runoff PPM has been 900-1250 throughout entire grow with some erratic readings even without nutes added.

 

[AutoWonders]

When growing under led lights, there have been times that I had to double the calmag. The plants look old enough to give it a full amount of calmag next feeding.

 

[looneyandtunes]

I will give them a full dose of Cal Mag from now on and start working up with the Sensi Grow A and B. Also will start with a weekly dose of Recharge. https://www.realgrowers.com/product/recharge/

 

[DABaracuss]

It wont go back but should stop the spread . watch new growth.I have seen ugly plants yield good still.

Sent from my 6045O using Tapatalk

 

[GoAuto6]

Well, how id the pH in the effected plants? You stated the ones doin good have a pH within exceptable range. But what about the effected. It could be a lock out vs a deficy.

 

[looneyandtunes]

Well, how id the pH in the effected plants? You stated the ones doin good have a pH within exceptable range. But what about the effected. It could be a lock out vs a deficy.

This started before any nutes were given.
Just RO water and OF soil.
Would there be a nutrient lock out from the nutrients in the Fox Farms organic amendments?
All 4 plants had PH ranging between 6.2-6.5 and fluctuating TDS readings. The full dose of Cal Mag Plus that they got about 36 hours ago added some darker color to them.