Arjan Strawberry haze yellowing problem

hi guys,
this plant is in its 3rd week of flowering, and was flushed a couple of days ago.
the leaf seem to be turning a bit yellow/very light green. i really dont know what im doing wrong
its in soil mix with perlite and under a 400w HPS
i feed her one 1L of water with 3ml of Canna PK13-14 every 2 days or so, and i try to make sure the PH is correct. i havnt used any nuts in the last two feeding.

any suggestion would be really appreciated.
thanks

Hi i am not a expert but every little helps there telling you that they need nutes or having too much nutes but if you have flushed start to feed again in the pattern you are they should back to the normal colour also when i have yellowish leaves i trim them off because the leaves is what feeds the colas but keep up the good work there looking nice.

cool, ill start feeding her again then. ill update soon.

thanks

Seems like it needs some Mg.
I'm not familar with those nutes, but make sure you give N too.