Diagnoses help please

Hi guys,

need some help here please I am really struggling to diagnose what is wrong with my plants having spent hours looking at various symptom checkers etc.

a bit of back ground - this grow I used some new soil - canna terra pro plus. Initially the plants seem to suffered from nutrient lockout, being a very dark green colour and also over watering leading to slow growth and an overall dark apparence. I have given a major flush with plain water, but they are still struggling.

I water with ph 6.2-6.7 and with my nutrients had 1ml per litre of a and b solution. The temps are around 24 degrees and humidity around 50%.

having looked at the pictures, would anyone provide a diagnoses of what these issues look like?

Thanks chris
 

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