Our plants do not seem to be doing so well. We have decided to take action and plant more lettuce in the empty rock wool. We added more small rocks underneath the rock wool because they are still getting moldy. I think that they are getting over saturated still. We planted about 5 lettuce seeds in each of the three empty rock wools. Hopefully with some luck we will have plants when we come in on Monday. The ph was checked and was around 7.