My planted tank is 48"L x 24"D. I have 2, 48" TrueLumen Pro LED 8000K lights on the tank. They are 17" from the soil surface. I started the tank with the DSM and the plants grew very well. The Stauro, in particular, grew like crazy and I even sold a bunch of it. Once I submersed the tank, I have notice about the bottom quarter of many of the plants do not do well; that is, the leaves die. The top 3/4 of the plants look healthy and are growing well even though I don't see any pearling. Another thing I noticed is that the Stauro grew flat on the soil when the tank was DSM. Now that it is submerged, the Stauro is growing tall. I am running my lights for 7 hours/day at full strength. I am running CO2, auto E.I. dosing, temp is 77, pH is 6.7. Am I not getting enough depth penetration with these lights? Should I just run my lights longer? What if I add a third 48" TrueLumen light strip? Or, maybe I should go with different brand of light. I have some ATI T5s but I want to stick with LEDs because of the heat issue in this room.