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what strain are you working with? the narrow fingers look like a sativa.

forget the CO2 and mixed spectrum stuff for now. it's like putting a supercharger and nitrous on a car that's missing spark plug wires and a clutch. strip everything down to the basics, get that dialed in, then go from there. walk before you run. patience was probably the hardest thing for me to...

i'm pretty sure whether you are taking readings in ppm or ec, it relies on the same, underlying mechanism. i'm pretty sure that my hanna multimeter reads ec, then converts to ppm using a constant factor. what you need to be more concerned about is taking care of your meter probe by storing it...

i didn't want to hijack another thread that this came up in, so i started a new one. it occurred to me a few months ago that i could put an old computer uninterpretible power supply (UPS) to use to backup my air and water pumps in case of a power outage, tripped GFCI, or tripped breaker...

no. some may argue that a particular range is ideal, and maybe it is, but you're fine. try not to let it get much warmer than 75. i've always noticed that the plants seem to take 3 or 4 days to respond to changes. that's for both soil and hydro. if you changed something a few days ago or if you...

i think earlier is better. when i grew in soil, i'd transplant them as soon as i saw a handful of root nubbins fully emerged from the stem. the longer you wait, the more the roots will be adapted to your aero cloner environment and the more stressful a transplant to soil will be. that said, i...

how often were you flushing? if you were flushing every week or two, then it makes sense that the organics didn't have time to break down into soluble, chelated forms usable by the plant. an alternative to brewing teas would be to dosing an aquarium with organic fert, letting it digest for a...

everything is pretty much the same as hydro. feed as you normally would, any kind of nutes or supplements. no need for bennies, no h2o2 as that would kill all the good stuff. and you don't feed often, because you never flush. i feed to 1000ppm, then wait until it's down to 500ppm before i feed...

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Nice to see more ap enthusiasts on riu!

Nice. Taking notes, as I'd like to eventually build a mini ap system. How did you remote ballast the cfl? Separate bulb and ballast and just run wires? Good idea!

almost 10 weeks, still no flush. silver haze starting to form some nice nugs. soo sticky! bent stems are getting heavy, so i have to string them up now. the aroma matures daily. i should be able to tell when they're done when they get "that" smell. great white shark was already turning...

http://www.agraquest.com/docs/labels-msds/SerMax-MSDS-051811.pdf says pH range in aqueous solution is 4.5-7.5. have you tested the pH of your serenade solution?

is it pvc? can you just slap a coupling or elbow fitting on there? that'll give you about another inch. if you need more height, snip a piece of pvc pipe and just extend it even further.

i run ebb/flow constantly with hydroton in 9" square baskets. takes about 9 minutes to flood, 4 minutes to drain via autosiphon (bell siphon), then repeats. the clones were originally rooted in rockwool blocks, which are still buried in the hydroton, yet i have no problems with it getting too...

why not just use a basket? air and light prune the upper roots that stick out. lower roots can be manually pruned or just left alone.

have you thought of rotating your reflectors 90-degrees, ducting them inline, and having a separate fan/intake/exhaust to air cool them? 2200watts is an awful lot of power to be pumping in an enclosed 4x8, even with an A/C. you could probably reduce your power consumption by at least 30% by air...

i had something very similar early in my current grow with tap water. determined it to be sulfur deficiency. epson salt fixed it quickly. i think the typical sign is yellowing with brown spots...

kiddie pools work great for keeping your floor dry. you can also just use a larger pot tray under the bucket. a lot of times, small drips in a new system will seal themselves as leaking solution evaporates, leaving mineral deposits. if you can get them, use uniseals instead of grommets...

just looked at the pics more closely. i get that exact discoloration at the very top when they get too close to the lights with my silver haze. i think there's too much light too early. small root mass can't keep up with photosynthesis and transpiration. higher RH will help, but i think less...