You need the calmag because It looked like your plants could use a dose and because calmag is the altimate source for magnesium and calcium which at some point in each grow will go deficent if you are not getting thoughs sources of nutrition from the nutrition you are using. Its the secret recipe to all heathy grows. Trust me on this one once you use calmag as an additive you will never look back.
Ive recommended this to many growers and they have told me they have never used anything that helps the p[lants as much as calmag does. You know I have never in the last couple of years used any ppm metres ph metres or anything and I have had nearly perfect grows by just using promix soil, calmag, sultz veging nutrition and tiger bloom and when I say perfect I mean like 1.25 pounds off a good yielding strain under a 600watt hps.
happy smoking