Day 70:
Brain Cake seemed thirsty and wanting more nutrients: Topped off water yesterday, added +3ml of hyro A&B and +1ml of power roots & pure enzyme. EC went from 0.8 -> 1.0
Day 71:
Brain Cake is showing symptoms, many top leaves have deformed tips and light interveinal chlorosis starting on opposite end of the tip and dark interveinal chlorosis at the end of the tip. EC is 0.8-0.9 (not very accurate meter :/ )
Not sure whether this is a nutrient deficiency or excess/lockout. The ph has been between 5.6 and 6.5 most of the time the past week, the reservoir change was 4-5 days ago. Plagron indicates to give more hydo A&B in proportion to their roots and enzyme nutrients in the first weeks of flowering (during veg these are given in proportion), so maybe these new problems are due to the different balance of nutrients that I may have times wrongly.
Finally the problems may be due to the water reservoirs holding approx 12 liters in practice and the Brain Cake drinks approx 2-3.5L a day so maybe the water res is very unstable but after a day the PH usually remains in range and the EC usually drops a bit the first day after adding nutrients and stays pretty stable the rest of the week. Any suggestions are more than welcome!
Day 72:
Yesterday evening made an upgraded reservoir for the Brain Cake dwc (as we suspect the leaf problems may be due to instable water because of small res and roots nearly completely filling the res). Now the Brain Cake is in a 60L box with approx 32L of water, EC set to 1.0 and ph 5.7-6.5. She seems to be happy, nice and perky this morning.
FYI the roots seem more orange in the video! They are on the white side though, just a bit of stain from the nutrients but looking very good overall.