rust spots on the leaf

This is a calcium deficiency all the way dude. Haven't checked your diary specifically so the general answer is to get yourself a calmag supplement. Botanicare, Cali-magic, either will do. It's only ever really needed when you see this issue so good to have it on hand. Feed as part of your solution at 1ml/L. If everything else with the plant looks good and this is all you're seeing don't change anything else. She'll be fine regardless and the addition of the calmag will clear this up within a week or two. Good luck with it - NL is a personal fave!

Calmag or PH issue