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I'm a newbie as well, just finishing up my first grow, but since nobody else has replied I'll tell you what I think: They look fine to me. Relax. Enjoy. It's not called "weed" for nothing -- it's a pretty hardy plant. Gonna be fine.

If you buy "activated carbon" in "pellets," are they all pretty much the same, or are some actually better quality? The "Acurel Economy" activated carbon pellets I recently bought cost me $20 for 9 pounds (on Amazon); you can pay a lot more -- for example Amazon has "Premium Laboratory Grade...

Welcome and good luck. I think the trick is to obsess about every one of the things you're asking, read all the different (and usually contradictory) opinions, and take your best shot. Chances are you'll end up harvesting some weed regardless. Second grow, maybe a little more. If I were you...

Yeah (@Theshepheard and @greg nr), there's something going on there... Gonna have to sit down and get scientific about it one of these days -- it's on the list, but a ways down from them top...

Thanks @budskey -- that's very helpful. I've been thinking it could also be a matter of TDS (ppm) of the water -- word on the street is that water with very little minerals -- like reverse osmosis or distilled water -- changes pH very easily, whereas tap water like mine, which comes in at about...

Good luck with that -- I am certainly not the numbers guru. But if you're having a deficiency problem, you might want to post a picture.

I've been thinking about something like this for an upcoming vacation. But I'm worried about the bubble stone -- I've read that running one continually in the reservoir will significantly impact the pH of the water (raising it, I believe). Anyone with experience there? If that's the case you...

Thanks -- that's just the sort of information I was hoping for. I've been using Botanicare Pure Blend Pro Bloom Soil Formula.

Funny... Thanks. As far as finishing, I've read a lot of suggestions to stop feeding nutrients two weeks before harvest, and suggestions as to how to know when it's time to harvest, but no suggestions as to how to know when you're two weeks before harvest... A time machine might help -- get...

I'd like to stop feeding nutrients 2 weeks before harvest; how do I decide when that is? My Northern Lights plants are in their 5th week of flower, so I'm guessing they have somewhere between 3 and 5 weeks left. I don't want to stop feeding them too early, and I also don't want to find myself...

Thanks; thinking of going with two...

Makes sense @Underground Scientist; thanks very much.

Please excuse my ignorance -- why wouldn't you use the $20 Dr. Meter lux meter with LEDs? Thanks.

How many 23W CFLs would you use in a 5-gallon "space bucket" that was only going to be used to start seedlings? (They'll be in the bucket for about 2 or 3 weeks, then they'll get transferred to the grow tent.) Thanks.

Thanks, all. @blu3bird - Thanks for the tip -- I had no idea they made such things -- will look into it. @WeedFreak78 - No nutes for the first 8 weeks. Probably I should have started feeding at 6 weeks -- they were small plants in large pots; I think they were good till then. Then I used...

So I recently learned that my tap water has about 400 ppm total dissolved solids (and my town reports that it has 62 ppm sodium and 94 ppm calcium carbonate). This I discovered while trying to figure out what's wrong with my plants, which are in their 4th week of flower after 2 months of veg...

Although it is not included in my town's water report, I just found a note on the town's water department website that says the concentration of calcium carbonate is 5.5 grains per gallon. This equates to 94 ppm, which is "moderately hard" according to the "Cannabis Encyclopedia" (Jorge...

Tested my tap water this weekend: 396 ppm. Ugh. Guess there is an RO filter in my future; going to have to get these through without it.

Thank you, last of the time lords. I will get some Cal Mag Plus this afternoon. One thing that keeps bothering me: Two plants, only one showing this problem. I've been saying they were both treated the same, but there is one small incident to describe that I used to think was not worth...

Yup, got a cheapo. Probably better than nothing; we'll see... @OldMedUser -- They don't list the ppm; will check that myself this weekend (okay, with questionable accuracy) and will report back. Thanks for the great list of books -- that ought to keep me busy for a decade or so...