Hello everyone, this is my first grow. I have a problem with a sativa plant, unfortunately i don't know the strain. At this moment is 55 cm, was healty since 3 days ago when began to grow a strange and thin leaves at top. The plant is under a HPS lamp 400W (18/6 hrs). Im feeding once time a week with 1 teaspoon of guano per 1L of water. Just during the last week i feeded her a little bit more because the old leafs on the bottom were becoming yellow. Thank u for every kind of help. Here the pictures.
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