Help!!! What's wrong with my plant?!?

I am doing a rubbermaid grow
Light: 2 27 watt 5500k bulbs and 2 26 watt 6500k bulbs ...24/0

Watering schedule: every other day (when the pot is light and it is dry as far as I can feel)
Soil: FFOF

Plant is about 3 1/2 weeks old but the growth has been verry slow so far. The new growth is green and healthy but the first leaf set is turning brown and papery from the leaf tip up. Even the second leaf set is starting to curl. I know that some of the curling down is due to phototropism since the plant is surrounded by light (don't mistake for overwatering). I have been watering with distilled water.
My first thought is that this is a nute deficiency because I haven't added any nutes yet after 3 weeks, but the plant is still very small. Also the most recent set of leaves is shaped weird...it has no tip
Am I right? Is it time to start adding nutes?

Oh yeah. And the temperature is optimal at 78 degrees but the humidity is low. Between 25 and 28

Since you've watered 15 times with plain distilled water and even though the FFOF should be rich in nutrients, you are washing away nutrients from the immediate surface of the very tiny root system. The plant definately needs nutes, but slowly. First, take a glass of FFOF, soak it in water and feed her first with the"tea". Also use this "tea" to compare in color to the runoff out of her pot to tell you if your soil has gone inert, assuming you don't have a ppm or ec meter. If this is the case, you can feed her 1/4 strength ferts till she reverts to vigorous growth.

Also the FFOF has a ph of 6.3-6.8, a little high. Always test the runoff to be sure of the ph of the soil.

Too dry. Make a dome out of a 2 liter bottle, she may be perspiring hot soil.

There's the answer I was looking for. Thank you. I don't have anything to measure PH with besides a soil test kit from home depot which doesn't work, and a ferry morse electric meter which also doesn't work. In terms of nutes, I might do the tea thing cause that sounds good, but also, I have AN iguana juice grow and bloom. Will the PH be good if I add 1/4 nutes of this to my distilled water? What I am unclear about is the relationship between soil PH and water PH

I would definately go for the pH strips or some cheaper method than buying a top-notch scientific instrument. They can be costly for a novice! I use pool and spa test strips (about $10 at Wal-Mart and comes with a good 50 strips, atleast). Try testing pH of tea first (after mixture has sat a good 24 hours IMO) then testing the runoff water. That should give you an idea of your soil pH and you can act accordingly to rasie/drop. You can also just water with distilled that's 7.0 pH already and then test runoff. A good safety precaution for keeping your pH balanced is adding a good 2 - 4 tablespoons of dolomite lime to each plants' soil mix in the beginning - this will help keep pH at 6.5 - 7.0 You can also simply add desired amount of dolomite lime to your topsoil before watering. Good luck - hope it helps! I'm still learning this too - if you ever stop learning . . . something's wrong! Peace!

Wow that's an old thread - oops! Haha!