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growing in 50/50 coco/perlite using a 600w MH I am using fairly hard tap water (270ppm) temps are 70 at night and 75 in day any help would be much appreciated! everything i do hasn't seemed to clear it up yet!

Had a massive revamp on my setup, haven't been able to test it out yet as my plants are not ready for flower just yet, but it will be: carbon filter->cooltube->fan->cooltube-> up chimney The cooltubes will have 600w HPS bulbs, The fan is upto 588 m3/hr, 6 inch diameter the grow area in...

Hey guys, I've recently started my 2nd grow and some seedlings are doing fine but some of them have no other growth than the cotyledons, which are starting to show brown marks and growth has completely stopped. I did notice as soon as they popped through the coco that some of them looked...