I have two ILGM northern lights plants going in a 2x2 tent with 24 hour light, both are in 5 gallon pots filled with some fox farm happy frog soul I had laying around. Both plants are showing signs of some form of deficiency I believe, any one have any ideas on what could be the problem and how to rectify it? This is only my second grow so I appreciate all the feedback 
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Oh and I should point out that the plant pictured is far worse than the other plant, the other one is showing very very mild symptoms
Looks like a magnesium deficiency. Are you supplementing calmag?
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Nope I haven’t added anything yet, just correctly ph’d water. I apologize in advance for the beginner questions but is calmag something I can mix into the plants water?
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Yup. I add a tsp per gallon in between feedings when I water and microbulate (add microbes. Apparently microbulate aint a real word.) Make sure you save the pH adjusting until you have added whatever you are supplementing.
It (calmag) is a must have going into flower.
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Awesome. I appreciate the info I’m gonna hit my local grow shop and grab some😁
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Growing in soul has got to be difficult 
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Agree with Brother @PurpNGold74 would also add the happy frog is ready for nutrients (4-5 weeks at best with this amended soil) and a dose of some beneficial bacteria/fungi. Recharge is an excellent source for these.
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What kind of light are you using and how close is it to your plants?