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It's a custom bubbleponics setup in 18 gallon tubs. I'll have three total tubs for 15 plants. We have one tub going with three plants in it. The other will have 6 each. We're using a digital gauge for pH, PPM, EC, etc. We're using Voodoo Juice for root growth in the one tub and it says to add...

when i do my first water change, should I empty it half way? all the way? do I add a new mixture of neuts each time?