What to do about yellow leaves DAY 14 FLOWER?

Hi, mate. I have a similar problem but my leaves are worse than yours. I sent e-mail to BioTabs with pics. I have a few guesses and trying to sort it out - light stress hence not enough feeding - N or P blockage in Coco due the luck of fertilizers - Cal/Mag issues I am also growing same plant with same BioTabs feeding schedule in soil and no issues at all. So I am thinking it's something to do with Coco become inert. I watered plant with orgatrex and top dressed with bactrex and mycotrex. Will let you know how I am getting. Hopefully, will get any answers from BioTabs. Also, I use a dripping watering system tropf Blumat and it's overflooded my Coco pot so I am thinking all fertilizers washed out and I left with inert Coco which caused my issues. If you are in flower now then might try to give more Phosphorus and Potassium and just a little bit Nitrogen. By all means I am a newbie and just sharing with you please do not take it as an expert advice Hope you will sort it out and write it in your diary for other people. Good luck Follow your diary

the yellow tips are signs of light stress or over feeding. Try and find the TDS number for the feed your giving them. eg. EC/PPM and if possible the runoff numbers as well. Good Luck