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thats a sure sign of overfert. heatstress has more of a tendency to cause leaves to curl upwards. I suspect your humidity levels may be on the very low side as well.

yes, am familiar. that looks like a classic mg deficiency but I also see some signs of possible nuteburn. good chance with those high ppms that something is loking out the mg. I would back off the nutes down to 1000 ppms and add some hydrated lime to your soil or fine dolomite lime for the mg...

the reason being that tap water 9 out of 10 times contains trace amounts of calcium and magnesium. distilled water contains netiher and considering he has a pretty bad ca problem, well... as for your other post regarding flushing with distilled water...it is always better to flush with 1/4...

does not resemble anything like an mg deficiency. if anything, it would be P, with the leaf tips doing 'the twist'. I would suspect you are overwatering these plants causing P to be locked out. may want to think about transplanting soon. back off your waterings. are you feeding them?> are there...

and use reg tap water not distilled. you can use hydrated lime half teaspoon per gallon boiled/disolved for the extra ca.

no. this is a serious problem. this thread got sidetracked a bit. you are displaying a bad calcium deficiency with what looks like could be P and/or k on some of the other leaves. you can not run an effective hydro setup without a ppm meter, how else can you manage the nute load in the res? with...

sure. looks like a HPS 70 Watt-should state right on the bulb. all you need is an extension cord with the same wire thickness as the ones with the light. snip off the female end, splice together and plug in. make sure lamp is in proper postion, i.e. horizontal, before ingniting.

I would imagine that any online hydro shop would ship to the uk

overpriced sugars I prob agree with, but molases and hydro just dont mix unless you are a 10 year vet grower. while prob overpriced, I have yet to find any real alternatives. the extra weight and desnity from the carbs is real.

suggestion-if u replace and replenish that res every so often, than really no need to do it again. you do not want to run your system with no nutes in it for longer than a day or 2. unless u r using a salt leeching solution like Clearex, tap or distilled water wont do too much to remove the...

boiling tap water is NOT distilling it. Distilling it involves collecting the steam vapors. more than likely your tap water is fine unless very hard. go onlin eor call your water company and ask them what the ph is and what the total ppm's are. there is much needed ca and mg in there that plants...

how the fuck you grew those with cfls is a mystery. they look fine. do what everyone said, check your ph, ferts, etc. 7 weeks even with full nutes she will yellow. she is eating herself, part of the process. by the time harvest comes, the more shit the fans look like the better of a job you did...

I see several deficiencies but also see signs of nute burn, which leads me to believe you have some minor lockout going on. if you havent flushed in a while now would be a good time to do so, 2-3 times your pot size. I also see signs of possibly overwater compounding the situation so if you just...

agreed with poster about molasses in coco. bad idea. it is an organic substrate and b/c of the microorganisms that will inevietably result from it, u run the risk of opening the door to pathogens if your environ is not 100%- had the same dilemma-very easy solution-Botinicare make Citrus Sweett...

its more complicated than that if the balast is not wored correctly given that this is most likely an outdoor light with a day/night sensor that obviously needs to be removed. If this is the case I will find u the link for wiring it. If not and already correctly wired, than you will simply need...

sounds lie u could have a host of issues. need to check for a light leak. flowering for 10-12 weeks sounds like a Sativa and generally they dont like very high fert levels. I would cut off the nutes for now and feed with water and molasses. temps prob an issue, too high of N right now could be...

sounds like you are on the right track. if you havent had problems before the flush than simply resume what you were doing. more soil is better than not enough. do you have proper drainage in your soil, i.e perlite or vermiculite?

looks like you have excessive salt build up in your res casuing lockout- that spotting could be calcium and the leaf twisting is usually P nd the dead edges is usually K. when was the last time you draind and refilled that res? ph ok?

you can see the water left on a leaf if it wascovered by one above it.

home depot and walmart sell Serenad in a red bottle in gardening-pick that up. if is mold, sounds like gray mold or Botrytis. also it usually starts in the bud and works it way down the stem, so do inspect your buds and any leafs on buds that are abnormally yellow/dying. and do keep the...