Leaf issue

[Nuggetz]

Dunno about ec and stuff mate. Usually up to 4ml per ltr with pm

Okay you’re in a hard water area though? Hard water nutes will have less calcium and magnesium as it compensates for the hard water being used. At half a ml per litre I’d say you’d be safe feeding at 1-2 ml per litre and seeing how they go after a feed or two.

If nutes are stripped out the soil general rule would be start at about 1 third to half strength and up it or lower it depending what the plant shows after a couple of feeds.

[MrC]

Sound mate, I'll let it dry out a bit then give it a good feed. It's not a massive plant so should catch up quick

[Valentina]

If you're using blurple LEDs, it's a blurple LED thing. The "Mg deficiency" is a symptom, not real IMO. I have had that in some of my plants, they can not be lacking in nutrients.