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Thats burns, either from the lamp or from too much nutrients (too early).
I'd guess you're giving them too much power, light or nutes, too early.
On the other hand, clones always look weak the first weak apparently.

http://www.weedfarmer.com/cannabis/p...buse_guide.php

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faithlessxxx Reviewed by faithlessxxx on . How far should i keep my 1000w MH lights above my new clones? How far should i keep my 1000w MH lights above my new clones? Rating: 5