Issues with calcium and magnesium due to PH sinking to around 5 in all pots. The two Autos stalled with bud development and had obvious necrosis and yellowing of shade leaves.
After the overwhelming response to my infirmary post I took it upon myself to try to remedy the situation.
All plants were given a light feed and strong mix of Calmag two days ago.
The autos reacted well to this with a noticeable fattening of buds and the trichomes perked up.
With that positive feedback, today the job was to bring the pH up.
Dosi do 1 was flushed out with 14 litres of 6.8 pH water in two batches, run off now reading 5.9.
Dosi do 2 was also flushed with 14 litres with runoff reading 5.8
SSH was flushed with 8 litres at 6.8 which gave me a reading of 6 pH.
Next step will be a feed plan until done set at 6.5 pH and a single one off foliage spray of Calmag at 15 ml per litre.
Side note; the SSH has been put into the cardboard box dark chamber for the last 5 days and seems to be responding well. I need the whole tent for it soon and am crossing my fingers that the autos finish up soon before the SSH muscles too much room from them. The only other measure I can take is to remove the SSH from the tent, bring the ts 600 out as well and use the lung room until tent is available. That will be last resort though.