Deficiency or OD?

@gmslave, Have a couple of bubblers in there. I have to say, these blue Stakes seem pretty s**t...not really much pressure in them/only really running water from one side when feeding but showing no signs of under/over watering. A very limited area seems to be getting wet. Also not overly sure how deep/far they should go from the stem/root plug - I have them deep (so as not to spray on the leaves - which I was thinking was one problem, a bit of splash from the tank when mixing) and close enough to ensure plug getting wet and roots getting what they needed. There was an issue where her indoors was taking a few "progress snaps" for me while I was away for a few days for an expected bereavement and stood on the timer (at some point, I only noticed on return) so was worried about a nitro OD - basically the flood feeder was going for over and hour or 2 at a time with maybe only 15-30mins off per feed rather than the other way about!!!. Also only been using the lower end of recommended concentration of calmag in the feed so thinking I should up that as its hard to OD Calcium, just to make sure that's not causing the problem? I use CF scale when working with feed so usually sitting around 9CF (0.9 EC) as no one ever says what PM scale they use when saying PPM! :P Water sitting around 22Deg C, 5.8/5.9p[h on a fresh change.

Not sure what temp your water is but everything else looks in line. I just wonder if all the clay is getting wetted with the one line droppers. Maybe check around the sides to see if your wetting most of the clay. If not it's easy to add a few more droppers to each pot. Cool water is essential and you do have a bubbler in your rez right? Bubbles do make ph rise so keep tabs on your ph in your rez everyday. Your ec for this stage is 4 to 500 ppm so that's good. If your water gets warm the plants slow in growth due to less oxygen in the water and can suffer. Older bottom leaves do die off as well. Cheers friend