Using autopots with just coco.
RO water, with canna mono calcium and magnesium, then full line of canna nutes at strengths recommended on their grow guide charts. PH 6.0.
Everything seemed pretty good until 2 weeks ago (apart from being stunted after being too aggressive topping) when I thought they were getting a nitrogen deficiency.
Leaves were turning light green to yellow to very pale from bottom up.
I ordered some canna mono N and added that, few days go by and they look worse.
So I remove the plants from their trays and decide to flush them in case its a nutrient lockout. I do hear people claiming its madness using 100% recommended canna nute strength but I've never really had an issue before.
So I flushed with pure RO (non phd) until run off was down to 0 almost. The first bits of the run off were off the charts on my ec stick so assumed this was probably the issue.
Refilled my tanks with half strength nutes and set them to go again. Plants have just continued to look worse and worse over the last week.
Was my issue not flushing with nutes? Not flushing with PHd water? Or was it just too late before I did anything and they were screwed regardless.
Thanks in advance for any advice.
Can take closer more detailed pics if needed
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