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What wattage is the light your using? Looks to me like light intensity stress or overwatering.

I would chalk it up as lousy genetics, nirvana is known for their Chrystal and Ice.

Looks like you need calcium but if you had a pic of the whole plant it would be easier to diagnose specifically.

Clearez too high causes the yellowing and downward curling.

Can't enlarge the pics because it's full of spam! Wish I could help but I can't see the pics.

Yogurt may work if your in a soil application but I have never used it myself to answer that. You can use Epsom salt for mg. For zinc you can use zinc sulfate, or a chelated zinc source like zinc EDTA, DTPA, EDDHA, or an amino acid type zinc.

You have temperature issues that could be ventilation or intensity of light. You don't provide enough info to really diagnose it. Are you in a cabinet grow and specific temps inside that cabinet. What type of soil are you using because I wouldn't be adding any food until it's much larger than...

When plants are this small they show a different sign when overwatered. Yours looks like the classic overwatering signs with the wavy leaves and yellowing of bottom leaves. You have enough food in the soil because it's lush green on your top growth spurt. Feed with water and lay off the watering...

I would have said chlorine toxicity or calcium deficiency, but you stated that you used pyrethrum. The pyrethrum is most likely the cause IMO.

Take a pic of the whole plant so we can really see what's going on.

This is like the 3rd or 4th post today I commented on overwatering. You seem to have the same issue, let them dry out a little more. Their doing the taco shell look.

Lower your water level by an inch and see if that helps in the next few days.

I don't do dwc but it looks like your overwatering, your lights are too close for the stage your at, and you need to feed them more food. I don't know if your using tap or RO water to suggest anything on food.

You should take pictures in regular light, under led its hard for others to see deficiencies and help you.

jim has the right idea here. If your not a pro yet, you should stick with base nutrients for a few grows before you start adding bloom additives. 20-20-20 is fine throughout the whole grow, I've tried that ratio and it's fine. The reason why your not doing well is because your overwatering. Lay...

Hi Uncle Ben, seen you over a decade and a half ago on overgrow I believe, your a good soil grower. May I ask you a few questions I don't understand? I don't understand why you say this is not enough N and too much P. You recommended a 10-30-20 which is basically 2-6-4. He asked about a 15-30-15...

I usually top all ssh crosses because they tend to stretch like a mo fo. If you find a skunk dominant one, all the colas after you top them will grow into the size of a main cola.

Have you grown it?

Its a cross of super silver haze. I've used this strain to breed with before and what I noticed was lots of variation. From my crosses I found a sativa that had the best taste, but kept a larger yielding indica variation also that had a similar taste just not as sharp. The yield made up for the...