Heck, mine is 2 1/2 feet above the tank without a reflector (also dual 48" t5) and mine are growing consistently.ok another question. My light is a dual 48" t5. Right now it sits " about" 6" above the plants. Is this to low? How high should I raise it? I assume its plenty of light? I forget what the timer is set at but I beleive its between 8-9.5hrs on.
If you have it lower you might get a little faster growth, but really with plants that are not aquatic you don't NEED the light that close. You don't have it close enough to hurt anything, but as the plants get taller you will probably have to raise it.