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i have black spots in the middle of my bottom leaves any idea what that could be?

Ive been using down. My plants look much better today thanks to everyone for the help.

I dont know what neutral buffer solution would be. I completly wash my vile out and then dry it completly before i use it again. However the good news is that I finally got the ph corrected its now just under 6. Hopefully my babies will look freshier in the morning they have really been...

My ph is finally starting to go down the last test was at 7.2. So i will continue to bring it down. I just really dont understand why its taking so much to go down. used 4oz's of the first brand and now 2oz's of the 2nd brand. The 1st brand said to use 1 and half teaspoons i used 24. The 2nd...

No nutes right now i tried some a couple of days ago and algae grew. I had some light leaks that i took care, changed the water, got rid of the vinegar, added h2o2 and algaecide. The water is crystal clear. The average ph in my area is 7.8 and it seems like no matter how much ph down i put in...

I just tried that i used 1 little drop on 2 liters of water it dropped the ph a full point i dont understand why its not working on my resovoir.

Does anybody else have any idea whats going on with my ph? Any help would be greatly appreciated.

The water is 71 degrees.

Ill check the temp now.

Its one those where you put 3 drips in. How could it be broke? I was lowering my ph before with vinegar and that worked but i read its not that great to use vinegar.

I have an 18 gallon rubbermaid container and I cant seem to get my ph down. I followed the directions on my ph decreaser and it says to use about 5ml for every 10 gallons. I used a half of 8 oz bottle and no change. I then returned that stuff thinking it didnt work and got a different brand...

Is a whiper 40 air pump enough for an 18 gallon dwc? Its hooked up to a tee with two 6" airstones.

I appreciate the reply i believe i got the light leaks taken care of now its just a matter of getting rid of this slime im gonna do another water change tomorrow. Is there any though that i can boil the airstones or something i have big ones with a very low budget right now.

Im having what i believe is an algae problem i did a water change last tuesday and cleaned it all out the best i can but it seems to be still growing. I wrapped the resovoir with ducttape and two towels cleaned the best i could and been adding h2o2 every two days since this happened. Any advice...

is there any light getting into your resovoir? DId you just start giving nutes and this happened?

Anything reflective will help but you can simply paint the walls with flat white paint it works excellent or try and get some mylar that works really well too.

Many things contribute to potency the lights, nutes, soil, etc. Remember plants will double or triple in size when you flower so make sure you have enough light.

Are those cups clear if so cover them up with tape or something. Roots and lights are a no no. And from what i can tell it looks decent to start with. Also you will need to get all your lights nice and close within a couple of inches from the plant.

Flower away

You want the ones that say day white for vegging and soft white for flowering. Or you can get an in betweener for the whole grow which say brightwhite. I would suggest 27 watt daywhite and then 42 watt softwhite for flowering. The ones i use are from home depot the brand is n:vision.