Cucumber leaves with yellow margins and dark veins
Cucumber
UK
Hello, this is my fist deep water culture (DWC) grow and decided to try Cucumbers for my Guinea Pigs. The plant is about 4 weeks old and I'm on 18 hours of light dripfeeding for an hour every 6 hours. I'm using FloraGrow's Micro and Bloom 10ml of each for week 3 for a 15ltr bucket. pH is kept at around 5.8 to 6 checked and corrected every 2 days. I started to see yellow spots and margins on the older leafs and now they are turning yellowish with dark green veins.
I thought it might be a Magnesium deficiency so brought some Epsom Salts and spry every night but it does not seem to be making any difference. Does anyone have any ideas, its probably something I'm doing wrong but not sure what. Its very difficult to identify the issue from pictures online. Any help would be appreciated.
Yellow Margins
Dark veins
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