IF you over-use anything it will kill your plant. usually the reason the plants fail is because of the high -P-K in your fert. a good mix for veg would be like a 7-5-5. using a high phosphorous and potasium fert
like 15-25-15 will cause the plant to get leggy. same with budding, you want to use more like a 1-5-5 or a 3-10-10, because nitrogen will make the buds loose etc... the thing is if you use too much of anything you will have disappointing results. You need more light dude. and some c02
prayer candles or a fermentation vessle are a good cheap way. cut back on the water and the fert. only add more when the plant tells you to.
MG all purpose is a good fertilizer, it's like a 15-10-10 blend, it contains alot of good shit that alot of others don't like molybidenum, calcium, magnesium, and potash. just use it in moderation. a 400 watt HPS would really do you good. it will pay for itself it the first plant.
good luck
ReD <I>