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Old 08-06-2018, 02:46 AM #1
jnlockar
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LED Cabinet Grow

This is my first time growing in a legal state. So specs its a 3 foot tall 16 inch's wide and 9 inches deep. I run a humidifier with a vent to the lower part of the box and have a small fan on the outside of the box on the top in a vent. The box was made for a 150W LED but I bought a 300W and the PC fans couldn't keep up. The temps before with the PC fans was 103 now it runs at a high of 83 on hot summer days drops down to 77 when the sun goes down. I germinated the seeds for two days then planted them 7/12/18.
Problems:

PH level shoots up very fast in less than 6 hours.

Slight light burn ( I know I can raise the light up and Iv been inching it up I want to keep it as close as i can)

Any advise on PH would help

Lastly I was wondering when I should start adding Nutes and Cal Mag. Also I have CO2 tablets. Iv never done hydroponics before so any advise on nutrients,PH,PPM please share.
Thanks
Happy Growing hope to keep updated
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Old 08-06-2018, 02:49 AM #2
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Strain is C99 Fem seeds
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Old 08-06-2018, 03:08 AM #3
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Welcome to ICMag!!

I see you're in deep water culture, which is my favorite "Roots-In" type hydroponic system. The biggest drawback to any "Roots-In" type hydro system is you really have to control the temperature of the nutrient solution.

In places I'm not able to control the nutrient solution temperature, I've found it's significantly easier to switch to a "Roots-Out" hydro system like drip through pebbles, or flood and drain. Something which dries out between waterings and provides a cooling effect through the evaporation going on.


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Old 08-06-2018, 05:38 AM #4
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The water temperature is 67F to 69F. I try to keep the PH at 5.8 to 6 but it spikes to 7 in just a few hours.
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Old 08-06-2018, 03:47 PM #5
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Quote:
Originally Posted by jnlockar View Post
The water temperature is 67F to 69F. I try to keep the PH at 5.8 to 6 but it spikes to 7 in just a few hours.
Excellent water temp. You'll need to be able to maintain those temps throughout flower.


When you add nutrients the pH goes down. When the plants use those nutrients, the pH goes back up. The larger your reservoir size, compared to your light/plant-numbers, the slower this rise will happen. The smaller the res, the faster the change in pH.


Another issue might be too much air. lol Does the pH go back down in 20 minutes, if you turn down the amount of air you're pumping in the res?
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Old 08-07-2018, 05:48 AM #6
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Its only a one gallon res so that would be it going so fast. I do have a 4 inch air stone. I run the pump 24/7. I have been aiming for a 5.8-6 PH but it just spikes to 7 super fast. Iv been using PH Down twice a day I would more if I had time. Im worried its stunting the growth ill be at a month of veg and the tallest plant is only 4 to 5 inches tall.
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Old 08-07-2018, 04:29 PM #7
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Set your pH at 5.4 and let it rise to 6, before adding nutes back to drop the pH back down. You may be adding nutes every day, but it will work a whole lot better than pH down all the time.
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Old 08-07-2018, 09:52 PM #8
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In my opinion that's not light burn but nutrient burn. Your nutrients need diluting. Do you know your PPM's?
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Old 08-07-2018, 10:23 PM #9
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Sorry I might be confused, but those are a month old and are that size? Are you feeding them any nutrients at all or just straight water? From the wording of the first post it seems you haven't started feeding them any nutrients yet? That would definitely explain the size.
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Old 08-08-2018, 06:04 AM #10
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I added some nutes the third week in and the plants just locked up the PPM was only around 300ppm. I just flushed them and haven't added anything since. My tap water comes out at ph of 7 and 50 to 60 ppm. Yea August 12th will be one month of veg and they are that small :( I ordered a bluelab meter to hopefully be more accurate with PPM and PH. I have a smaller airstone would that help with PH? I also have CalMag should I be adding that everyday too? Thanks everybody for the help happy growing. Ill add update pics tomorrow.
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