3 of my seedlings have wilted, and I have no clue why. I recently transferred them to a new grow station using 4 T12 Daylight tubes. The soil I'm using is house brand potting soil (no fert). The others seem to be doing great. They are getting plenty of water and temperature is between 80-88 degrees. I have the flourescents about 4 inches from the plants. What do you think it is?