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It could be pH flux, which causes burning like you're seeing. Ideally you want a consistent pH, big swings in levels will cause problems. Flush with pH 5.9 to 6.1 adjusted water, if its much higher it will just shock the plant and compound the problem.

P.S. I'm inclined to go with a 400w light... or should I grab the 600?

After more reading and thinking I've decided for now that purchasing something like this: http://glandorehydro.com/Grow-Tent-All-you-need.html might be the easiest way to get it all going pronto. I'll be going with a slightly smaller tent 80 x 80 x 180 and using a run to waste system. I don't...

600 watt one would cost me about the same: http://www.ebay.com.au/itm/600w-Magnetic-Ballast-Bat-Wing-combo-HPS-MH-lamps-Timer-Yoyo-Growers-/330779935393?pt=AU_Seed_Starting_Hydroponics&hash=item4d040542a1 But would it be overkill for such a small tent?

I'm thinking about purchasing this: http://www.ebay.com.au/itm/230873099959?_trksid=p5197.c0.m619 and maybe this light to go with it: http://www.ebay.com.au/itm/330781164722?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Would the light be too powerful for such a setup? Any tips on what...