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Could be many different reasons to that problem. Bad genetics, bad seed, damage prime root etc. It happens, sometimes it will start growing again, sometimes it grows extremely slow and sometimes it just dies. At least, that's my experience when that happens.

Yes, I know that. But that's the recommended pH range from what I've read. I just checked my "Hydroponic basics" book and it says "Most hydroponic plants grow well within a pH range of 5.5 to 6.5." Then the coco is pre-buffered to 5.8, so it can't be that bad :P But of course, chili can prefer a...

I had no idea that chili wanted higher pH than other plants. The customer service of the nutrients I use told me that I should aim for a pH varying from 5.5 to 6.3. And that's what I've read is when plants nutrient uptake is optimal. I got pH-meter and I check it regularly. I still think that...

I'll consider buying an EC-meter, but at the moment that's out of question due to an empty wallet :P I usually let half of the water I put into the tank get used up, then I empty it and water other plants with it and fill it up with water from my aquarium. I live in Sweden there's about two...

I use a recirculating system if I didn't point that out. I use tap water because we have really good water quality here. It's so good they basically pump it here right from the lake :) I have no EC-meter and from what I've heard it's a good thing to have but not necessary if you just follow...

Just checked the roots. There's nothing wrong with them. They're really white and healthy.

The EC-value of the source water is 16.4mS/m and I know some manudacturers do. I'll stop spraying them with water, but that can't possibly be the cause of my problems, can it?

I do not run run-to-waste since I think the nutrients are way to expensive :P And I've seen successful grows in recirculating systems, so I thought it'd be fine. They are time controlled but not volume. Since that doesn't really matter in coco coir when the excess water just runs right through...

2-3 times is recommended from what I've read. Yes, it's a drip irrigation-system. Sometimes I spray the plants when the lights are on, could that be a serious problem?

They got both nitrogen and magnesium in the nutrient mix I give them. And it only happens to a few leaves. The pH in the coco coir is 5.8, and besides that I always pH-correct the nutrient solution to about 5.8 which is fine. And I'm not growing in soil so I can't just mix anything into the...

But now they've only got leaves in the top and they got a 600W HPS burning above them and the light reaches every leaf there is on the plant. So they shouldn't drop the bottom leaves like that I think. Also, as you can see in one of the last three pictures. It's not just limited to old leaves...

Here's some other pictures:

Just like last year I have a problem with yellowing leaves on my chilli plants. Then the leaves and flowers fell off. Last year I had two types of chillis with this problem. This year I have the same problem with yellowing leaves of both of the old ones and two new kinds. The two from last year...