Need help identifying

This girl is a GG #4, growing in 2:1 happy from and ocean forest and bottle feeding biobizz. At first I only noticed the spaces between the leaves getting lighter so I thought i was a cal/mag deficiency as I've only been giving it RO water. I've been feeding it calmag since I first noticed it and now it seems to be getting worse, affecting more leaves and now a lot of leaves have small black/brown spots on the veins of the leaves and some leaves have a few bigger spots. Im at a loss for what to do at this point and am afraid the plant may be going downhill fast
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