They are in 6-inch pots, under a 75-watt fluorescent gro-lite. They seem very fragile and weak at this stage and I am worried.
The reason the seedlings are growing tall and skinny rather than shorter with sturdy stems is that they are not getting enough light. When they are light starved they start growing tall in an effort to get a closer to the canopy and unobstructed light.
Even though the light has a clear path to the plants, they are not getting enough because the light is not intense enough. The solution is to give the plants more light. For every square foot of growing space, the plants should have between 40-65 watts input of high-pressure sodium light. If that is inconvenient, use metal halides. It is difficult to produce good buds using incandescent or fluorescent lights.
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