Today was the five day mark after we planted our seeds and two had already begun to sprout and were petruding from the rockwool about half an inch to a inch. Due to the nutrient mixture, there was a small layer of film sitting on top of the water in the system. Due to the quick success of the system we opted to not make any changes to it and we would see how it would fare during the next class period.
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Once they start they realy take off. Youre system seems to be working well.