Need help with this deficiency

[Johnnysgarden]

Started to see this on my plants two weeks ago and some plants seem worse now and some look nice and green .not too sure what it could be. When I look at charts it looks like a few things possibly. I'm leaning toward magnesium?
Plants are 4.5 weeks old, topped week 4. Growing in canna coco says pre washed and buffered ( didn't wash myself this time) using house and garden Coco's a/b , multi Zen and roots excellerator at half the feed chart. Also using calimagic by general hydroponics at the recommended feed rate (normal feed)

 

[Silverfox125]

Give me a little more info please.

what are temps?
how confident are you in your ph?
How high is light?

 

[Johnnysgarden]

I'm running at 25c and humidity between 52-57( very dry this time of year where I am so hard to bring up) I use a bluelab pH meter(the basic model you could say) calibrated 2 weeks ago . pH between 5.8-6 . Two lights in room one kind xl1000led(blurple) r55% b70% w70% and 38" off canopy (mfr says 36") other light is equinox 1000 quantum board (white) at 70% and 30" off

 

[Johnnysgarden]

One more thing to add I'm doing a test run of some strains so there's 4 different strains, two sativa two indica and all the strains are doing it

 

[Silverfox125]

Man you’re doing everything right. That blue lab brand just killed my ph theory as I’ve heard they are the best of the best.

calling in the big guns

@Pennywise any thoughts?

 

[Pennywise]

It’s definetly a magnesium deficiency. Raise your ph up a little higher. Also increase your lighting if it’s mainly on the bottom leaves. You may want to increase your calmag a little as well. I’d run ph between 6.2-6.5 for a few feedings.

 

[Johnnysgarden]

Thanks for the help @Silverfox125 and @Pennywise . I will do all that and see how they respond.

 

[Pennywise]

Keep us up to date on their progress ok.

 

[Johnnysgarden]

Thanks again. Plants looking great now. Starting to really take off. The color looks a bit off due to led light and my camera