Light yellowing of leaves from the edges and spots on another plant

Week 3 hydroponic system
Ph 5.8
Ppm 1100
300 w hps lamp

Running 3 different sizes of plant's at 1 ppm is going to piss someone off.

What do you suggest?
I am new

You need to lower ppm to 500 if you use RO water. Do you use any other amendments?

RO WATER AND NUTES THATS IT

So I have the leaves have started to droop. Please let me know if I have done something wrong, I am really concerned
Week 4
Ppm : 600
pH : 5.9
Light 300 w LED
WHICH IS ABOUT 15 MINUTE INCHES FROM THE PLANT

I have reduced PPM because of the yellow spots on the leaves , I was at 1200 ppm initially in week 3 when I started noticing yellow spots. I was asked to drop the PPM and now I have.

damaged leaves wont recover. Newer growth looks better.

@TheSadVeryBadMadGrower what do you say about drooping

Seriousblack said:

@TheSadVeryBadMadGrower what do you say about drooping

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It's hard to tell. Plants " droop " for various reasons. Over/under watering, lights about to go off. High temps and so on.

Water was almost half way through the net pot, now I she reduced water level to 1/2 inch below net pot. Temp is not more than 22-23 C

Now for next week should i move to 1500 or should I stay at 500 ppm?

Seriousblack said:

Now for next week should i move to 1500 or should I stay at 500 ppm?

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I have never Ph'd anything and I don't go by ppm but I am a soil grower. Allow others to guide you. That is a big jump though I would think?

But week 3 was 1200 , then because of the spots i reduced it to 500, now week 5 i am confused

Seriousblack said:

But week 3 was 1200 , then because of the spots i reduced it to 500, now week 5 i am confused

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I would gradually increase instead of making that jump. You reduced for a reason. Little goes a long way.