New Grower How do I adjust the ph of my soil???

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I just discovered the ph is low in my soil. The reading is like a 4.5. Can I just adjust my water and fix it that way?
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Yes! You are risking nutrient lock-out (something I ran into). Adjust your water to 6 - 6.6 pH and water it, take reading of the outrun and try again.

Also, when watering with nutes, check whether the nutrients you are using don't already bring down the pH of the final solution.
 
I forgot to ask about is the process the same with all mediums. I'm using ProMix BX. This is my first time using it and I'm using foxfarm trio for the first time also.


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I have about an inch of growrocks on the top.


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And I also forgot to mention that her color is dark green. She looks yellow because of the HPS which is a sunleaves mini pulsar 250 watt.


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I'm about to add another 250 watt hps. And I have 10 4ft. daylight 32 watt tubes that I can add.


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My room is 4x4x8. I've been stuck on trying to decide if I should divide it and have two 4x4x4s. One for veg and one for flower. But at the moment I'm stuck also because I have 3 autos that need 18/6 and 3 that were bag seed from some mid. The pic is one of the 3. I had them in flower for 13 days and then my autos arrived and I was anxious to start them so I reverted back to 18/6. So now I'm just going to beg them until the autos finish. I'll probably take a few cuttings just for the fact they are female.


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