hmm im kinda stumped too. try posting in the Indoor Growing forum, you will get more visitors.

in the meantime, check out this problem guide, it might have your solution: International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!
dutch.lover Reviewed by dutch.lover on . Brown spots on leaf tips of clone- So my buddy took a clone from me. It has rooted fine and began to grow. I learned afterward that the soil he cloned the plant into was the miracle gro fertilizer in the soil type. The plant was transplanted into a larger pot with good soil (but the initial root mass is still in the fertilized soil). Plant began to grow fine for a few weeks, then all the new leaves (and old too) began to get small brown spots on the tips. Then the spots began to move closer to the stem. Now, it has Rating: 5