I'm curious if I'm doing my lighting right for my seedlings. I have
one of the Professional Jiffy Greenhouse 72 peat pellet seed starting
kits, and I'm starting my seeds for my garden.

Anyway, I have two 18" flourescent fixtures- one with a GE Plant &
Aquarium tube, and one with a GE Chroma 50 tube. I set the
fixtures/tubes directly on the plastic greenhouse top, and rotate them
each day, so that the plants get an even mix of Chroma 50 and Plant &
Aquarium light.

The vast majority of the seeds sprouted quick, and are growing madly-
most of them have their cotyledon leaves & stems almost to the top of
the plastic greenhouse top- they look kind of spindly right now. No
true leaves have shown up yet.

Is this a problem, or is it common for the cotyledon leaves to shoot up
really high and quick? I read that lack of light will cause leggy
plants, but I'm not short of light with my setup, am I?