Help! Yellowing leaves?

HopsWithRabbits

New Member
Here's the problem:

My plants were doing GREAT at a high humidity (80%) on accident it lowered to about 50%-60% and now my plants either had a deficiency before this and it's just making it worse or Im not sure. All the plants (2 strains) are exhibiting yellowing on all/most the lower leaves

Soil is a mixture of fox farm potting and ocean forest.

I tried to research without asking and came up with it being a possible magnesium deficiency so I added some calmag.

Am I doing right? Please guide me.

I attached photos of all the plants.
 

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