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As the picture denotes, the optimal range for your plant is between 6.0 & 7.0. General Hydroponics suggests the range should be 5.5 to 6.5. We find that 6.0 promotes the most healthy growth for your plant.
The pH will fluctuate daily, the key is to not over react and add too much up or down to correct the pH if it shifts. As the plant takes up nutrients the pH will change. If large adjustments are made, the pH may need to be adjusted in the opposite direction the next day. Make only slight adjustments.