Hello, first time post and first grow. Can anyone help me. I have four plants that are six weeks. Plt 1 is 8 1/2", Plt 2 is 13 1/2", Plt 3 is 7" and Plt 4 is 8 1/2". They all have same conditions. Mg 24-8-16. Originally use fluorescent tube but switch to 600w of cfl. Good circulation, constant...