1st grow rust spots help

Hi all this is my first grow in a 1 1/2 ft by 2ft grow box using a 200w dual spec cfl it is northern light blue auto in 15l pot using boibizz allmix i started feeding around 3rd week using only canna terra flores 0.5ml to 1l gradually upping the dose shes been in now around 34 days from seed and im currently feeding 2ml terra and 1ml canna boost i have no idea what is up with the leaves been searching the net and dont no if it is a deficiency or nute burn theres little rusty spots on the bottom leaves and there turning light green and crispy on the edges while some have only got 1rusty spot in the middle of the leaves. thanks for help appriciated

They look a bit over watered and over fed to me.


The leaves are clawing which can be a sign of many things, and when trying to diagnose a plants issues a lot of the time one deficiency will cause a lockout of another. Adding more of the second nutrient causes more problems than good even though the plant is lacking the nutrient as it can not absorb certain nutirents if the balance in the soil is off.

If it was mine I would let the soil dry out completely, this helps get air to the roots which will solve any overwatering and prevent any root damage. Then I would give the plant just water and see if things improve within a week.

As for those very bottom leaves they seem to be touching the soil so cut them off to avoid rot.

By the way this is in the wrong area.