my plant is about two weeks old with alot of leaves on it, im using cfls, in a waterfarm hydro system my plant is growing great but i added some cal mag to my gh flora micro and grow nutirents and now the stem is turning a whitish color? the stem was purple but the plant is getting pretty big now and i think maybe the stem is about to turn green and get thick? anyone have a clue or any advice? ill try and post some pics later! please help guys i appreciate it!