@MissUniverse dont panic its not going to ruin your grow. I saw earlier you mention that your ph never goes above 5.9 was that you?
I can see a fair bit of Ca def in that last pic its absorbed alot better at around 6.2 in hydro so maybe let the ph creep up a bit.
It does really look like some P def too are the lower fan leaves going yellow/brown slotchy? Phoshorus def starts lower and works it way up- you'll notice purple/red stems as well.
My advice is make up new rez- lower the grow nutes and add some extra bloom and cal mag but dont go too heavy on the ec.
Keep note of ph and ec/ppm of fresh res then check after 12 hours then we can work out where to go from there