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Dude, Sledgehammer just killed my White Widow in coco. I can't believe it. The plant was super healthy, at 28 days in flowering, with nice nugs. Green leaves, healthy. I never used sledgehammer, always florakleen, so I gave it shot and tested it on one plant. The next day, she was all drooping...

Yes, you can save your grow. Flush with a mild solution of nutes, ppm 200. Use florakleen or something like it. Run water through until the run off reads about 500ppm. Then let them dry out really well before you water again. This time, water with just cal-mag plus and water. Let them dry out...

Tap water is most always fine, at least here in the states. Test your tap water PPM and PH. For Chlorine, you cannot boil this out. You must let it evaporate. Fill up a big tote and let the water sit for 24-48 hours before adding nutes. Put an air stone in it too, so it is not stagnate, and it...

When you see leaves that point to deficiency, don't get all hasty or freak out and start giving it more nutes. Consider your plant's history first. Have you been feeding it every time you water? If so, consider a salt build up. Is it in hydro or soil, or coco or rockwool, etc. Soil, coco...

Here is what I would do. Flush with lots of water first, like 5 gallons per pot. Put in florakleen. Ph to 6.5. Flush the crap out of them. Then let them dry until they are SUPER light. If it takes two weeks for them to get light when you pick them up, then wait two weeks before you water again...

Why not just put a good 90 bend in the duct, or as the other guy, but an S bend in it. I doubt you need to make the S end out of black meterial. All I have is a 90 degree bend in my duct and I see no light.

You should try one or two plants in a 5 gallon or bigger, 10 gallon, but wider. Also try using pure rockwool. Low Stress Training (LST) of course to get like 40-60 tops. Check out this guy on youtube that did this with one trainwreck and got more than a lb of it under 600w. On another forum...

I've seen great grows that were only vegged with t5s or even cfls, then flowered under hps. You will get faster, bigger veg under an MH, though.

This is true. GH Flora or Maxi powder series. Both make getting slime extremely easy in any type of water system, drip, spray, etc. Use the three part liquid series. It's much harder to get slime that way. Run tests to see for yourself.

That looks like a nitrogen problem. Perhaps toxic build up or not enough nitrogen.

FYI, your plants were droopy before you transplanted to coco. They were still very young, so watering was the issue, no doubt. Either the ph wasn't what they liked, or you under or over watered them. Here is what I do with my clones and seedlings while they are in coco, soil, or rockwool. Let...

This was the most annoying thread I've ever read. Next time listen to those with more experience. Do the damn tests. Choose one or two plants, and try watering them different, in this case water one more often, and water one way less often than your standard watering for the rest of the plants...