Leaves Curling under

The leaves on my plant have curled downwards, and turning a bit yellow on the younger leaves tips. The older leaves are developing a bit of brown on the ege of the leaves. What can i do to fix this? Ive heard the browning tissue on the sides of the leaves are from heat stress, or over fert, is this true? and will they return to normal or are they permanently scarred? As far as the curling under, i dont know, they havnt curled any more but theyre not straightening out either. Theres a 3 foot 2 fixture T-8 with 6500k h\o lamps above it, I do have a t-10 18 inch flouro on each side. Its just lost its perk, its still growing alright though, new shoots are forming nicely and younger leaves seem ok.
 

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