I also have Blackjack from Nirvana, i want to hear some info about this strain, but i have looked all over the net and cant find anything about it....not sure why, because its such a promising strain and very beautiful too...My blackjack plants are vegging right now and will be going into the flowering room in about a week or so...So far they have very fat leaves, very indica-ish...i have no stretching like your friend is dealing with...all of my Blackjacks are short and doing very well...i also have Sensi Seeds, Afghani#1, The Flying Dutchmans The Pure(skunk#1), a skunk variety called Purple Bud growing right beside my Blackjack plants, and the Afghanis are 100% indica, the blackjacks are growing just like them, no stretching at all, so you migt want to tell your friend to move the light closer to the plants... Fluorescent tubes are the best thing to start seedlings out with..they dont get to hot and the plants can grow right up to the tops of the lights, meaning no stretching at all...my plants are 5 inches tall with 5 or 6 internodes, its probably about a 1/4 of an inch between nodes...nice and tight....hope this helps, Im still looking for quality info on these blackjack plants, if anyone has ever grown this strain please let us know, alot of people are looking for good info on this promising strain.....Thanks, and happy growing...later...