There has been a lot of growth and everything is going well. The leaves of the lettuce are over 6 inches long and long extremely healthy. The water level dropped more than it has in the past. This is probably because of the size of the plants now as compared to before. I had to add almost a half gallon of nurtient solution to the growing system. We will probably need to keep a closer eye on the water level now that our plants have gotten so big. However, our water culture system holds over 4 gallons of solution so it should not dry out. This was a design concept we built in from the beginning. After adding the water I checked the pH it seemed extremely low once again. I added some pH up mixture. I then checked it again and the solution still seemed pretty low, but I figured it still needs time to mix. I will check it again soon and see if it is working out. I suspect it will be fine because we have been having issues controlling and keeping a constant pH throughout, but we still have tremendous and healthy growth.