Not very experienced myself i have done a few and got a few going at the moment. TaNg is a master from what I have seen but one suggestion for the fluctuation in winter would be to try and go the other way and try make it warmer at lights off rather than trying to exhaust all the useful warmth with it being winter... only a thought mate
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Well I don't know if you're in a tent or out in the open or what but from my local hydro shop I bought a small oil filled radiator with a thermostat on it so shouldn't be on when light warming the place I was in the cupboard under the stairs so confined enough to heat it enough ( you might have said where you was growing but I have had my after work joint already so you know )
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No worries pal TaNg might come up with a better solution still happy growing all and these look great as usual TaNg!!
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My biggest problem is knowing what to add and when. I have canna a and b, cannazym, rhyzotonic, pk 13/14, small amount of overdrive. Never used calmag although i think i should have in the past. Just wish someone like tang could give a rough idea of a schedule using these products and if there is anything else I need. Just want a decent grow