What's going on with some of my leaves?

[largessemoonflight]

Hey guys, I've been growing cannabis for the first time ever with a few autos, Quick One and Northern Light Auto from RQS, normally any issues that have popped up in the past I've managed to identify and correct but I still have no idea what's going on here:
There seems to be these red/brown spots all over some of the leaves in one of the two plants, plus some yellowing. I've been feeding it BioBizz Bio Grow since week 4 and haven't switched to flower nutes since I read online it's good to start them on week 2-3 of flowering. I'd appreciate any help.

 

[Phyto]

Switch to flower nutes, I usually start to ramp up flower nutes a week or so before I flip.

 

[GNick55]

Hey guys, I've been growing cannabis for the first time ever with a few autos, Quick One and Northern Light Auto from RQS, normally any issues that have popped up in the past I've managed to identify and correct but I still have no idea what's going on here:
There seems to be these red/brown spots all over some of the leaves in one of the two plants, plus some yellowing. I've been feeding it BioBizz Bio Grow since week 4 and haven't switched to flower nutes since I read online it's good to start them on week 2-3 of flowering. I'd appreciate any help.

google septoria

 

[Bullmark69]

Use this chart and don’t deviate. Those spots could be any number of different issues. Your leaves are turning down which may signal that your light is too intense….or it’s too hot….or you’re watering too often.
What’s your medium? How are u watering? What’s the water source and are u adjusting the PH?
Also, they need less N and more P&K from now till harvest.

 

[largessemoonflight]

google septoria

I've already googled it and it seems similar but at the same time not too similar. Still scared since it seems to be quite nasty for the plant.

Use this chart and don’t deviate. Those spots could be any number of different issues. Your leaves are turning down which may signal that your light is too intense….or it’s too hot….or you’re watering too often.
What’s your medium? How are u watering? What’s the water source and are u adjusting the PH?
Also, they need less N and more P&K from now till harvest. View attachment 2307854

I've raised the light a bit higher today in case that's it, I can't dim it though because my lights are non dimmable. I'm using BioBizz Light Mix, hand watering and I throw in a bit of Bio Down to lower the pH since the tap water where I live is very hard.