it sounds like you have a damping off problem.this is normally caused by fungal growth.never use outdoor soil or reuse soil from a previous grow.if you must use those types of soils,put them in the oven at 375 for about 20 minutes.that should clear up the fungus.
Depending on the size of your grow room,you will need to install adequate ventilation.also use oscillating fans to keep the air moving.until the seedlings have at least two sets of true leaves keep the CFL at least 10" away from the tops of thyem. hope this helps.
Deejay2163 Reviewed by Deejay2163 on . What Happened to my Seedlings? Ok, for the last week these seedlings have continued to yellow and stagnate, with little or no growth at all. I don't know if it's overwatering, underwatering, or heat. We've still had some 75 - 80 days here in SoCal. The PH is fine and I am using a single 95w CFL that puts out about 6000 lumens for this seedling stage. I intially had it only a couple inches from them but it seemed to get warm under the reflector hood (up to 90f) so I moved it up a couple more inches. Maybe these bigger CFLs Rating: 5