I planted these (White Widow x Buddha) a few weeks ago from seeds they were doing awsome till recently they started getting spots on the leaves, also some of the leaves seem to have no moisture in them and they are kind of curling, i have 3 plants only one of them is still ok, the 2 others have this. I haven't given them anything except for water at this point. What causes this and how do I fix it? Also if it matters they are currently under a T5 High output fluorescent grow lamp thanks a ton in advance!!