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if you're tapering off your nutes, flushing isn't as necessary, and if you do flush, you wan't your flush water to include all non-mobile nutrients, which are secondaries and micros. You don't want to flush with pure RO unless possibly if you're in soil.

good call on location of thermometer. Attached to light won't be accurate. Sunleaves makes a digi therm/hygrometer with a remote probe that you can twist-tie to a branch/ stalk in the canopy. Your fan looks like a Vortex knockoff, so may be noisy, but should be able to push/pull plenty of pascal

There is no need for an intake fan. It would be beter to run all fans as exhaust, in parallel, not in series. What type of fan is it? Some fans have godawful static pressure ratings and cfm will plummet with addition of carbon filter. Have u checked temps with no carbon filter? Is the exhaust...

The biggest factor in stretch is genetics. With a mostly sativa strain like Jack Herer, you're most likely going to get a fair amount of stretch no matter what you do. Environment does play a role, but you will never keep a strain like JH as squat as Romulan or BlueWidow. When I grew out...

Fogger droplets are too small and LPA droplets are too big. Read up on Fatman's Medium Pressure Aero. His setup gets you into the right droplet size range without the need for pressure tanks.

Make sure the hollow stem is sealed or it will disrupt turgor pressure. Pinch it shut with a clothes pin or stuff some bubblegum in or saran wrap it.

If you have room in your temps/VPD, then it may be. But I another option to consider is stepping up to a 600w digi HPS, which are the most efficient at turning watts to lumens/PAR, even more efficient than 1k's and way more efficient than 400's, especially if your 400 is a core and coil ballast.

You might be ok if the 2nd tent is dedicated as a veg tent with batwing, and you put OG hood in first tent with AC. Otherwise I would try and hook ducting up in parallel to the AC, instead of in series.

What you'd need is a 7 day digital timer with more than 1 off/on event per day, like a GE 15136. Then if you program it to start the first 12 hours of the first day as a dark cycle, then 6hrs40mins of light, then rinse and repeat 12 off, 6:40 on, you'll get 9 light cycles in 7 days. or do it 6...

Lawyers make Blumats add for outdoor use only to cover them from home damage liabilty due to indoor flooding. A similar example of our over-litigious society is auto-makers not giving some cars any tow rating, and recommending against towing, but then you buy a hitch from uhaul made exclusively...

Do you run 8/16 then? Have you ever tried 8/12, so you get 72 light cycles in 60 days, and does that shorten flowering times?

Have you considered running Blumats?

DJ Short for the real deal, but I will say thst Dinafem BlueWidow is very nice and carries a lot of flavor of the blueberry while being very easy to grow.

window shaker AC's are the most efficient, and you can use larger, insulated ducting than what you can get on a dual hose portable. Wether it works or not depends on a lot of variables. I've never tried it personally, just read that it works. I googled those pics, if dude above says the box was...

No minumum, but a maximum. If the substrate has high levels of co2, the roots will have a harder time expiring co2. This is why you don't run co2 at night. With no psii taking place, plants take in o2 through their stomata at night, and expire co2. Running co2 at night makes it harder for them...

Mr. Nice G13xWidow smells like this. It's like a skunk smell but extremely sharp and toxic, even more-so than RKS. I've described it as what you would expect to smell at the bottom of an Area 51 fire pit.

That's only true at night.

It is true that plants can only absorb a limited amount of light per day, so if he has very intense lighting, it could be possible. I like to start at 12/12 and decrease by 15mins every other week.

A better idea would be to build a duct box on to the back of a window shaker ac sitting in your room. Let me see if I can dig up a link... https://www.rollitup.org/t/convert-window-ac-to-portable-ac.668832/

That's correct. Same way it's of no use to fish. Plants and fish breathe aqueous oxygen. The O2 in dirt has to first be dissolved into the water in the dirt, from the air in the dirt. Thats why you have to let dirt dry out between waterings but DWC roots can stay wet all the time. You can't...