Help with white stuff on stem in aerocloner

room temps stay around 71f to 75f and 55% humidity. Im not sure about the res temp cuz I gotta get a res temp gauge this weekend. Still no roots, and the bottoms of the stems are turning brown a little. Im gonna give up soon if they dont start to recover and come back to life. Next Im gonna try cloning in rockwool with clone gel and see if I have better luck.

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