First 5x5 Tent Grow 1000W (Master Grape Kush)

Hey guys just started my very first Grow, have a couple questions about my plants, so a couple of my plants 2-3 of them have these brown blemishes on the lower leaves/yellowing leaves

atm my watering is 5.8 in a Coir/coco Pro-mix medium
my plants are kinda small i feed them with sensi grow A +B every other feed about 300ppms
my tent right now has a pretty powerful fan so my humidity in the tent stays pretty low about 25% quite hard to get it higher ive got a humidifier and a bowl of water and a little fan blowing on the plants
currently trying to patch up the window to get cold air from coming in, trying to maintain 82F lights on and 68F lights off

Would appreciate some tips and some help along the way!

Ill update my thread every now and then with pictures
Had to place my little babies in the washroom since its warmer and its a bit more humid

Hey @arcalion,
It doesn't seem to be an issue of RH, but of nutrition. I've had the same levels of humidity before (or maybe even lower) and this never happened to me... You should be fine if your level doesn't go below 20% (I'm not saying this is ideal), however if you wish to increase this level try using a swamp cooler, look up DIY Swamp cooler on google if you want to save some money (Pour water at room temperature and no ice in it if you don't want to lower temps that much, but it will lower them anyway)... I know you said you have a humidifier but it doesn't seem to be working. A bowl of water isn't going to do anything, lol. You have to get that water airborne somehow, so unless you place it in a place where the heat of the lamp evaporates it, you may ditch that bowl...
How dry is the environment surrounding your tent? how big is your tent? what's the size of the fan you're using (CFM)?

BobMoses said:

Hey @arcalion,
It doesn't seem to be an issue of RH, but of nutrition. I've had the same levels of humidity before (or maybe even lower) and this never happened to me... You should be fine if your level doesn't go below 20%, however if you wish to increase this level try using a swamp cooler, look up DIY Swamp cooler on google if you want to save some money (Pour water at room temperature and no ice in it if you don't want to lower temps that much, but it will lower them anyway)... I know you said you have a humidifier but it doesn't seem to be working. A bowl of water isn't going to do anything, lol. You have to get that water airborne somehow, so unless you place it in a place where the heat of the lamp evaporates it, you may ditch that bowl...
How dry is the environment surrounding your tent? how big is your tent? what's the size of the fan you're using (CFM)?

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The whole entire house sits around 23-25% right now with RH, and im probably going to be giving that humidifier back anyways since i get it a refund if i give it back before 90days, so for those small of plants how much nutrition would you suggest? would it be safe to go 600ppm?
i'll probably skip the whole humidifier all together since once theyre flowering im sure the humidity will increase to around 35%! and ill be ditching the bowl now haha

Hmmmm... I'm not an expert on the matter since I don't grow with soil, but I would think it's probably a phopshorus deficiency but it could be something else since your PH levels seem to be fine. This is RO water we're talking about right? I mean, you're not using tap water are you? If you are, what's the ppm of it without nutes? You could probably try going to 1 mS/cm, which is arround 600ppm depending on the meter you're using...
Try posting this pics and your data in Marijuana Plant Problems, you might get a second opinion...

BobMoses said:

Hmmmm... I'm not an expert on the matter, I would think it's probably a phopshorus deficiency but it could be something else since your PH levels seem to be fine. This is RO water we're talking about right? I mean, you're not using tap water are you? If you are, what's the ppm of it without nutes? You could probably try going to 1 mS/cm, which is arround 600ppm depending on the meter you're using...
Try posting this pics and your data in Marijuana Plant Problems, you might get a second opinion

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mine RO is 6.0-5.8, i basically boil tap water and use filtered water and use a PH Downer i bought at a store to bring it down to 5.8 and get the temp around 21.5C, without i just use the water thats about it, and alright ill try that

You without a doubt need some cal mag plus. I go by ec. My tap water runs at about .4 and at first I did use tap water but now use RO. I start by at least bringing it up to .4 with cal mag, then add what ever nutes on top of that. And if I still start to show a def I add 3 to 5ml on top of that. So .4 would probably be 200ppm. But from the looks of the size they should be fine with 600ppm of nute and 200 of cal mag. Yes you count the ppm from your calmag but not really. You don't want to sacrifice to many nutes to get enough calmag in there but right now you need calmag more than nutes so adjust accordingly. I don't know if I would go over 800ppm. Me personally I would use 3ml calmag plus, should put you around 200 to 250 ppm and then bring it up to 700 ppm with your nutes. I set my ph to 6.2 and my runoff ph is 5.7.

jaredlee said:

You without a doubt need some cal mag plus. I go by ec. My tap water runs at about .4 and at first I did use tap water but now use RO. I start by at least bringing it up to .4 with cal mag, then add what ever nutes on top of that. And if I still start to show a def I add 3 to 5ml on top of that. So .4 would probably be 200ppm. But from the looks of the size they should be fine with 600ppm of nute and 200 of cal mag. Yes you count the ppm from your calmag but not really. You don't want to sacrifice to many nutes to get enough calmag in there but right now you need calmag more than nutes so adjust accordingly. I don't know if I would go over 800ppm. Me personally I would use 3ml calmag plus, should put you around 200 to 250 ppm and then bring it up to 700 ppm with your nutes. I set my ph to 6.2 and my runoff ph is 5.7.

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Hey man i've got sensi grow A + B, i got a PPM reader and a PH reader, my run off is at its perfect level of 5.8. Atm i just transplanted all my little babies into bigger pots. The whole reason why they were yellowing is because i basically didn't give it enough nutrition. my next feeding is on sunday so ill be giving it about 600-700PPM. currently im trying to raise the temperature in my grow during the night time because the exhaust fan just sucks out all the air and leaves the room around 64F which i'd like to keep at a steady 70F so i'll be going out to buy a heater for this, hopefully something for less then $200.

This is what I used. I don't think there much on amazon. They look good man. Just want to green them up. If uping the nutes don't do it just try a little cal mag.

jaredlee said:

This is what I used. I don't think there much on amazon. They look good man. Just want to green them up. If uping the nutes don't do it just try a little cal mag.

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nice plants man, and yeah i think upping the nutes will do it. atm since i transplanted them they've gotten a bit greener anyways. but sunday is the nutrition day, cant wait haha!