help please

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I am not real experienced, however without more details I can only say you are burning them up with nutes and or Light! Also do not know your setup, but I grow DWC and place my hydro rocks around rock wool which contains the planting. I do not know if direct contact with the rocks is a good thing???
 
I would say that they are burning up. You want your EC to be zero. The plants have no roots to process any food. You are killing the clones by giving them food. Plain water. Phing your water could also be a problem. The main reason for proper pH is the uptake of nutrients. Regular distilled water is a good choice to clone in--neutral pH and no undissolved solids. Also depending on what your Rh is, you may need a humidity dome.
 

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