Your plants are just showing their displeasure of growing under lights.
Even though you and I have tubes or Cfls on our plants, it still is not enough energy to GROW our stock. WE are giving the plants enough light to maintain them, not the light to grow them through the roof.
If I ( we ) wanted to do that then the cost to maintain the plants would exceed the cost to replace the plants......Unless it was a money plant
AS for water and fert, our plants are almost dormant with the conditions we are growing them in....our plants do not need fert in the winter because they are not actively growing like they would in the summer, same way with water, keep it dry.
Here are some pics of leaves taken almost daily from my stock, they look just like yours.
Of course this is what works for me and it might not apply for every one .
Do not worry, it seems like we are doing something right. Right.
