Some of the leaves on my plants are yellowing/ browning on the edges, one has what looks like a bronze rust on it, and my og kush doesnt seem to want to grow. Im doing a bubbleponic setup, the temps in the room is about 75. They are in 5 gallon buckets, im using botanicare grow, and cal mag, it says to use 1 tsp per gallon for seedlings, i used 4 tsp in the buckets, and 3 tsp of the cal mag. Waiting on my ph tester to come in the mail. I thought it might be nutrient burn so i took out a couple scoops of water from the buckets and added fresh water to them to lower the solution.