It definitely looks like it is needing cal/mag, but I would also go to the hydro store and get fresh calibration fluid and calibrate your PH meter as It looks like the PH is not right. It has been my experience that when plants look like there are several types of deficiencies at once, that is coming from PH being off. I would verify that my PH meter is measuring correctly, but I would also add some cal/mag, about 5ml to a 5gal DWC bucket.