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I do not think you need to buy any more pumps. I have a 72X36X25, and 2 work fine for me. Run 1 pump at full to get a gyre. If you run it with the programer you can go about 1 minute, then have it switch off and the other pump switch on. The flow will reverse (if you have the pumps positioned correctly). The other option would be to get a wave timer and run the pumps at longer settings (like 5-10 min) before reversing. The theory behind the gyre flow is that instead of random flow canceling each pump, the movement is continuous and not canceling. Look for 20cm per second flow.
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