first off...the soil.....idk, but imo, you should only use plain soil..nothing in it.....

second, how did you root the seed? it looks like it needs strength or something....what condition are the roots in? how much did you handle them? i only know of plants to get that purple colour with some kind of trauma...but i could be wrong....what is the temp?

third....i would think about your lighting...some strains need more light for one, and for two, cfl is known for often needing more wattage than hps or something...you need to run more wattage with cfl for lumens...as i said, this sometimes is the case...you should see if you can find anything about the lighting requirements for this strain....

just my two cents...usually worth one.....lol