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I have around the same water volume as you. I used 3 inch pipe without issues. My numbers should be on one of my previous posts. Spend the money and get a PVC needle valve to regulate flow off the supply pump do not restrict the output. It takes about 1-2 months to start working. I'm keeping my nitrates around 10 right now but you can go lower with this if you want. The flow rate recommended is for the start up. You may need to increase the flow in the future to prevent Hydrogen sulfide from forming in the reactor. Once the bacteria use up the nitrates in the reactor they switch to sulfur. If you increase the flow it'll supply more nitrates into the reactor. Any time I smell sulfur I slowly increase the flow til I don't. You will get slime on the output at first but once your nitrates decrease it'll clear up as the bacteria have less food to multiply.