Mystery Problem please help...MUST READ

Hi everyone I am an indoor grower and just moved my grow box from my garage to my basement. Unfortunately the last couple of grows have not gone too well and I am seeking advise. I use roots organic potting soil with about 3 tbls of dolomite lime to keep the ph balanced. The water I use has a ph of about 6.8. Two recent plants that I sprouted grew fine for about a week then they shriveled up and died. Both of the plants stems i noticed were very thin and brown. The last plant that I grew was a white widow strain for GHSC it was about 20 days old and very small for its age. I knew something was up but it could not be a ph issue because everything I was giving the plant was balanced. I had about 4 60w cfls on the plant. I took a look at it today and it completely shriveled up and died. I watered the plant about once every day or two. I thought that I had a fungus problem because it was in my basement and from the symptoms of the plant and with a good ph in the soil I figured that it may be damping off or something. I Therefore seized watering it for about 3 days then it just died. Throughout the plants life it had a very weak, thin stem and very slow leaf growth. Like I said I know its not a ph issue but what else could it be? There is great ventilation in the grow area with several fans and a dehumidifier so the air doesn't get too moist. If anyone has any idea with what could be going wrong with my grows, help would be greatly appreciated.
 
Humm.. Lets start with the lighting, tell me everything... Is it 60w equivalent? Whats the spectrum?

(i use roots as well and never have problems... I dont add lime... My tap water is about 7.0 i get it own to 6.5 when i wter by filtering it...)
 
I had 4 60w, 100w equivalent cfl light bulbs with a spectrum of 6500k. Roots organic soil with lime so the ph is balanced. The plant was in my basement with lots of fans and a dehumidifier. Im not sure what caused my last two plants to fail I just woke up a shriveled up dead plant and I'm not too sure whats going wrong, maybe damping off???
 
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