deficiency help..

Hi im in need of some help, I'm having a deficiency I cant quite figure out, I thought either magnesium or maybe a little light burn. I have just flipped to flower and I have 2 or 3 plants showing a deficiency and rest are growing well.. My garden is canna coco and was buffered, I use advanced nutes with a general hydroponic calmag, i always check my ppm and ph when hand feeding and they drain to waste any help or suggestions would be very appreciated!

Sure looks like deficiencies @SaskStoner420 -- I'd look to verify your pH and ppm readings, calibrate your pens, use a color test to confirm pH, whatever you can do without too much effort. Or maybe effort and/or spending money is worth it. Have you checked the pH and ppm readings of your runoff? How close are those numbers to what you start with?

I just replaced my two cheapo pens, both were giving me inaccurate readings and causing me issues.

Looks like nute burn.