With the last days of our class coming to an end, we are noticing browning on the leaves. What we have figured this is from is a low nutrient level in the solution or the roots are becoming over populated and can not grow properly in our smaller system. We have also notices that the plants are drawling a lot more solution than normal due to the fact that the roots have started to grow down into the solution. This is not necessarily a bad problem because then the plants roots can grow as will, and hopefully solving the problem of brown leaves.