Hello ! This is my first grow and as you can see the edges of my leaves are slowly dying. She's about 6 inches under a 6500K T5 Fluorescent grow light with two bulbs running 18 hours a day. Gets watered every other day with one and a half liters of 5.0-6.0pH water and I am not using nutrients atm. Temperatures are maintained so it doesn't get too cold at night. Usually 70-80 degrees. Is my light too close or am I adding too much water? Her new leaves all look so good at first but they end up slowly dying at the edges. Any help is appreciated