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I'm growing in a drain and flood system using the lava rocks. I have the plants in grodan cubes and watering once a day. The plants are about 3wks old and the roots are brown. For how old they are the root are about 9in long. What can i do to get the roots healthier? I have added a 4in air stone...

No your right on. My ppm of my tap is only 132 and 8ph, i used the conditioner on the rockwool cubes. When i put my ph meter to the cubes it reads 6.8 is there any way to lower the ph of the cubes? Can I cut them in half, there 4in tall cubes. Or is is that im using tap water. Trying to save...

Plants are about 2.5 weeks old have the ppm at 300, and watering 1 a day for 15mins.

Im checking the PH before I add the new tap water.

I'm growing in a flood and drain hydro system using the medium size grodan cubes in my lava rocks. My problem is that every time i water my girls my ppm rises by about 40 and my ph rises from 5.9 to about 6.8 every time. I understand that some water is evaporating and i am losing about a gallon...

Do I have to change the water every time I change the strength of the nutrients? First timer. I know to flush before harvest but is that the only time?

Hi everyone, i'm new to this and will be my first grow. I was thinking about buying a 78x78x78 grow tent. My question is will this be big enough for the plants to grow Tall. What should I do get the grow tent or build a grow room? Please help need some good advice. Just became a medical user.