Is this a Cal/Mag issue?

Looks like adding the Cal Mag and Revive helped out, Girls are looking better and starting to grow much faster again! Thanks for the Help!

Just a quick update. Just finished feeding the girls. I added 2ml/l of Calmag Xtra, and Revive. Also diluted my solution to 1100 ppm, EC and PPM is confusing, but I think I have a better understanding now after reading a few articles, more on this below. Solution PH 6.1 Run off PH 6.4 Run off PPM 1300 light PAR raised to 700 Keeping a close on them for the next few days. So, more on my EC issue... Up to this point in my short growing experience I had only heard of PPM and EC, usually looking something like this. 1.4 EC = 980 PPM Well now I know there are a few different scales, and its not always obvious what scale is in use. EC expressed in single digit with a decimal (Millisiemens) is easy to recognize. but it can also be expressed in Microsiemens (Millisiemens * 1000) and then we have at least 4 different scales for PPM, PPM500, PPM550, PPM640, PPM 700. I am still not 100% sure if i should use 700 or 500 scales?? So far I have been using 700 but keep seeing mixed opinions. My charts are now in microsiemens. Anyway enough rambling. Check out this article for more info. https://www.cocoforcannabis.com/osmosisandec/

Thanks for the help Spacecadet55 I will try some of your suggestions and give an update in a day or 2. Uk420Show Thanks for your comments as well. Just an FYI, I am growing in coco with Fabric Pots. But I haven't added any perlite. So maybe a rootzone issue...

Hmmm this is a tricky one. I don't think its cal mag. I defenatly don't think its light either I think your problem is more root related in my experience. Though saying that it does look very much like the start of a cal mag shortage. Hmmm my educated guess with my limited experience in soil. Not enough oxygen in the root system. But I'm sure more experienced soil growers can shed more light on this for you :)