I think it’s a combination of calcium / mag / p and k defs
2 months is a long time to run with a 5 gallon. Its definitely depleted in some nutrients.
I personally dont think its cal mag, theres no yellowing between the veins and theres not a bunch of rust spots.
I think you just ran out of nutrients in general in your 5 gallon pot after 2 months growing.
If you buy a bag of ocean forest you can only use just water for about a month. Then you start getting problems unless you start top dressing or feeding nutes of some sort.
But that just my 2 cents
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Basically nutrients are divided into mobile and immobile. I don’t explain here the difference between mobile and immobile (you can easily google it), but I can explain that this is a fondamental starting point for identifying problems.
Mobile problems (usually macro nutrients) appear in older leaves, while immobile issues (including micro and Ca…) appear in new growth. Easy, this is science.
This obviously is the start after you have excluded all the standard parameters (water, soil, ph, temperature, air, humidity etc etc).
I can’t tell you for sure what the problem is because I would need much more data, but many times the problem is identified by excluding what is “not”.
Seeing those dark green leaves and knowing that you are in flower I could risk nitrogen toxicity
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