Leaf edges curling up

Does anyone know why most of the edges on all the leaves on my plants are curling up? I have 4 plants that are 4 weeks old.. 2 of them are doing far better than the other 2 but the leaves are curling up on all 4 plants

you have to much light, and your over watering, raise you light up about 3 feet or more

I've got a digital ballast..if I have it at 3ft what setting should I have it on 250, 400 or 600?

Also I'm using coco with 20% perlite, I got told to water everyday..but i had a feeling i was watering too much..so i let it dry out abit for 3 days(they are in 15ltr pots..theyre still abit moist) i watered them 1ltr per plant and going to continue to water 2-3 times per week

Coco Casualty #91290

Vinny1989 said:

Also I'm using coco with 20% perlite, I got told to water everyday..but i had a feeling i was watering too much..so i let it dry out abit for 3 days(they are in 15ltr pots..theyre still abit moist) i watered them 1ltr per plant and going to continue to water 2-3 times per week

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i was told the same by some dumb ass that you can water in coca even 3 times a day but what most people fail to mention is that only when the plant is in full flower
15ltr pots with such a small plant i wouldn't water then every day more like 2 times max a week

Kipn said:

i was told the same by some dumb ass that you can water in coca even 3 times a day but what most people fail to mention is that only when the plant is in full flower
15ltr pots with such a small plant i wouldn't water then every day more like 2 times max a week

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That's exactly what I'm going to do mate just 2 times a week..it's the same with light distance..so many different people say you should have a 600w hps about 18-24inch above the canopy.. but fail to say that's when they're in flower..certainly not the age my plants are.. found out the light should be 3ft MINIMUM from my plants