What kind of deficiency (calcium?)

Hey everyone, I’m in my 4th week of flowering and now ran into problems. Before this week everything looked great but now I have leaves dying rapidly. Any help would be amazing on what this is and how to fix

Info:
650w VIVOSUN grow lights
Fox farm ocean forest
12/12 light
Only given small amounts of FF big bloom nutrients
Water every few days in 10 gallon fabric pots

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If these are older leaves and the new growth is looking ok its possible she was deficienct at one stage and then amended when you added your nutes, which happens often with soil. However from what ive been told by the growers that use FF its meant to be fed as a trio, there’s 2 other products you should be feeding also.

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What was the last run off PPMs and PH Growmie? :love_you_gesture: don’t forget to feed the full trio, Big Bloom is missing the needed Nitrogen, potassium and phosphorus that’s in the Grow Big and Tiger Bloom

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looks like cal-mag issue, along with light being too strong. How close are ur lights? Do you know your PPFD from the top of the canopy?

Really need to incorporate the entire liquid trio when using Fox Farm. Like @OGIncognito aready stated, the other 2 are necessary. Also need to know those input/output numbers.

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