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That's my 1 grow in peat, so i didnt take care about the slightly low ph of that medium: 5.8 - 6.3
At first week or 2 i get food ph up by adding rhizotonic. I think it was not the best idea, because there was no cal mag in ro water at all, so i think ph was not buffered by calcium and then it cannot buffer my medium.
Result of that was runoff water with ph 5.6-5.8 and ec 1.9 - 2.6 yeah and the rising ec was lowering my ph more...
So i rinse plants with just ro + calmag water with ec 0.3 and ph 6.8- 6.9 and 1 day later plants start looking better
So i can say Lester Beans you were right about ph and leaves looking symptoms
From begining I think I should be using calmag and phUP.
Some of those photos were taken just few minutes before "night" so plants looks sleepy
I don't really know how to get rid of this crinkle. A few plants just got it.
Was trying magnesium, potassium, calcium foliar on this plant - no success... today ill try cann mono trace elements... ehhh