When we returned to class after thanksgiving break we were surprised to find that our lettuce plants had multiplied and grown rapidly after harvest. When I took measurements on the 28th of November our tomatoes were grown over a foot tall. The water level was a little low, so I added solution to the what solution was there. On top of our system there was a salt like material that seemed to gather around the down pipes on our system. I still have not found out yet what that is from. But there was some brown spots on the tomato leaves, so I checked the ph level and that was normal at a reading of 6.3 PH.