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Pretty sure this is a Ca deficiency but wanted some confirmation... Tap water is ~80ppm, Feeding 7G/Gal Maxibloom and up until this morning 4ml/gal cal-mag. Just upped it to 5.5, but this seems like quite a bit of Ca to show this much.... Been showing for maybe a week or two lightly but my PH...

Setting up a 5x9 and just wanted a little confirmation before I drop a ton of money on all this stuff there isn't better alternatives. Going DTW in coco, emitters fed by a cycle timer. This is what I have so far 5x9 Gorilla Grow Tent 2x HLG-550s 2x 8" Hurricane Inlines 1x8" Carbon Filter 1x...

Actually got in and measured yesterday, pretty off in terms of dimensions. Attic is 100x10-12ft, widest at the ends. about 2ft of height at the wall, 7ft in the middle with approximately 70 inches of width in the center with at least 60" of vertical space. Current plan is to do a flowering...

Sure this question has been asked a few times, but I'm having trouble finding what I would call a direct comparison. For ~300 dollars is there a cob setup that could compete with the output of the 315 fixture? Whatever it is, its going into a 36x36x72" tent with a 450CFM inline and a carbon...

Hey Guys, Brand new to cmh but it's looking like the best way to keep temps in check and still get results close to that of a 600w HPS in a 3x3 space (supposedly the perfect coverage area for these lights). When I was looking at the 600W, I assumed I would have to get a 6" inline @~450cfm, fan...