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Leaves start browning and dying off at the center. They get way worse than this but I removed the worst affected leaves before I decided to post the problem here. Just 3 or 4 plants have it in a 50 plant grow. Only seems to affect fan leaves so far. Some sort of root problem?

The only brand nutes that I know that I can find here are Advanced nutrients and Fox Farm trio and they cost 60 bucks and up for a half litre set, not in the original bottle, no way to tell how old the nutes are, etc. There is also this local brand T-Rex, that I guess fashions itself after...

Recently I stumbled on this here: http://www.tomtop.com/led-grow-lights-360/p-l1346eu.html So this is about 90 bucks for a 300 W led set. I was thinking of switching from a 500 W cfl setup to 2 sets of this + some cfl support. Is stuff like this just too dodgy or OK to give it a go in...