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Hmm...thats a tough call but its going to have to be yours spacely...i would say don't even mess with the MG due to personal experience using 1/16 strength and still having problems....IMO from what I see in the pictures you dont need nutes yet, and there are hardly any of the appropriate micro nutrients in that MG and the ones that are in there are a little low as well...the stalk and stems are all still green and healthy looking...it does look like it could use some CaMg to give it a some added green to the leaves, plus the Ca activates the (K) potassium in the soil which regulates the water and nutrient levels in the plants cells , so it boosts anything you currently have as far as natural nutrition levels....
I googled CaMg supplements in my zip code to find something...turns out there was a hidden hydro shop right down the street, got a bottle of CaliMagic (1-0-0 CaMg booster) for $7 and some change, I used it all throughout veg and she loved it...however the added nitrogen is a little much in flower so Id suggest one with a (0-0-0) rating...they had one as well but at the time she was nitrogen def and I was waiting for his shipment of Fox Farm Grow Big...I later ended up getting the rest of the trio because of how much it helped my plants....it's a little on the pricey side for the small bottles as well..but it's also going to last me a few grows as well ; )....after experimenting with MG and cheap stuff it ened up costing more than if I would have just bought the Trio to begin with...now I'm out double because of using MG to start with....my personal experience though, Ive seen alot of people say they had no problems but noticed a huge difference once they switched, as most eventually do.
Not saying you have to go FF..Advanced Nutrients A&B are very good too from what I've read and they were cheaper and easier to deal with(part A for veg, B for Flower)...General Hydroponics Flora series seems pretty good too but I've heard mixed reviews and it's a little pricier than AN as well....but again after I switched it I'll personally never let someone use MG without sharing my exp lol
Sorry for the long posts just dont want to see anyone go through what I did with the MG Devil