Need some wisdom again. Yellowing tops

OK so.

Firstly I wanna say to start with I worked out mu grow and bloom nutes wrong. So for the 6 weeks of my plants life's instead of giving 3.5ml per l I was giving 2ml per gallon. I know I'm an idiot.

But I just wanna make sure it's because of this why my tops are going a light green/yellow colour.

Ph is 6.0 and the run off is 6.2. Growing in coco feeding 1-2 times a day.

My light it roughly 12-18inches away and it is a 600w hps.

Temps are 20c night and 28c (high) day.
RH is between 40-50%

Any help would be greatly appreciated as its boggling my mind a bit.

Love you

Pics

Not all who wander are lost.

Bit of wisdom there

you will get there mate, hopefully someone with a brain will come along and helpninna minute.

I left mine somewhere.

12 inches might be too close, 18 is probably fine. Move your light up a little. You should be going by your ppms rather than ml/l, we can't help you without knowing the details. You might be feeding them the perfect amount. Your plants seem to have darker leaves on the lower parts of the plant, is that correct? I'd check to see if it's light bleaching first, I see that all the time in pics here.

Yeah the lower growth is a lot of a darker green than the top. I have raised it to around 22 inches just to be sure anyway. It could make sense because I've only noticed it recently and I switched to a 600w from a 250w. But it also looks like it could be potassium problems. But I'm never trusting google again

Rurumo said:

You should be going by your ppms rather than ml/l

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Yeah I know. Sadly I overlooked a lot of things like a lot probably do and wentnin kinds unprepared for the things I'd need. I have one on the way from amazon so I can monitor it properly then