Can someone help me, please?

im havin a little trouble with my plant. Heres the info, its 2 months old, in soil, i preflowered her outside to make sure i wasnt wasting my time, brought her inside a little over a month ago and put her under 2 42W CFLs. added a third CFL when she got a little bigger. she was doin good till i brought her inside. i increased the light by an hour a night until it was 18/6, so its been vegging around 3 weeks id say. i had a gnat problem, but i have that taken care of now. i dont know what can be wrong. the leaves are turning yellow then brown very quickly at the tips. in time, it takes over the whole leaf, then the leaf dries up. also when the tips start turning, they turn downward a little then upward when they get really dry. it started at the bottom leaves but now every new leaf is coming out with a dark tip. the growth is also very stinted, i know part of this is because of the preflowering and gnats, and i have very few old leaves left. the plant is only 8 inches tall. its growing pretty fast now, but the new growth tips are still coming out dark and dying 2 weeks later. ive repotted into clean soil with know ferts. ive also put it on a 12-19-10 fert ratio with a little MG added in. ive done this only twice and it still hasnt fixed anything. i dont know what else to do. my plant seems to be dying just as fast as its growing. o yea, and the Ph of my soil is 6.2. could the gnats have caused irreversible problems? any input is greatly appreciated. (sorry i dont have pictures, i dont have a digi camera for some reason)

^my grow box is 1.5'X1.5'X2', temp. is around 75, and lights are a good 7-8 inches above my plant

the problem is your plant started to flower (aka started to die) and you put it back into veg (reincarnation) immediately put her on 12-12 if you want her to bloom n e time soon. if not, then go 24/7 and hopefully she will reveg. veg again for at least 4 weeks to get her healthy again...

love, kp:p

thanks but shes reveggin great now. shes growin alternate nodes and theres a new leaf every morning when i wake up. the problem is these new leaves come out with dark tips and then start dying. at first i thought it was heat stress so i moved the lights to 8 inches away. nothing happend so i i flushed the soil thinking the miracle grow soil might have been a bit too strong for her. nothing happend. sprayed the gnats with insecticidal soap, repotted the plant into a soil with no ferts, and covered the top of the soil with a layer of sand(not beach sand) to stop the gnats from reaching the soil. all the gnats died but the plant didnt get any better. i didnt nute the soil for a week thinking the problem could still be over fert. then i added some fert. and epsom salt because the symptoms had me convinced it was an Mg def. but nothing happend. so im still stuck, its vegging and growing budsites (i LSTd it to get bud sites growing well being that the leaves are only lasting for about 2-3 weeks then dying.) if it doesnt recover in a couple weeks im just gonna flower it and see what heppens.

maybe overwatering. i just wrote an extensive reply on how to repot into dryer soil, but erased it while trying to find a link. sorry babe, hope this helps. i'll be back in the morn;)

love, kp:p

Is a 6.2 ph too low for soil? I thought it was supposed to be 6.5-7. Not a soil grower so I could be wrong....

ive done a lot of searching around and it really looks like nute burn, being that the new growth tips come out appearing burnt. but i dont know how this could be considering i didn't fert the new soil i just transplanted into until 2 days ago

Man you got me...sounds like you've tried everything....good luck....

just looked at my plant, has 2 new shoots, both of which arent burnt! im thinkin the problem was over fert being i was using miracle gro soil. but now that im using clean soil i think its starting to recover. thanks for the help guys and girls

lol yeh, that will be your problem, good luck tho man..:)