- Install Aquasuite, assuming you're using Windows.
- Inside Aquasuite, you should see your D5 NEXT pump. Under that pump, there's fan settings. Set the fan curve based on your "Data Source" (in this case your water temp)
If your D5 NEXT is not shown in Aquasuite, it's likely that you forgot to connect it to the motherboard USB header using the included cable that came with your pump.
When you purchase your highflow NEXT, it'll also come with a USB cable. Connect it to your motherboard USB header and it should show up in Aquasuite. It too, has a built-in temp sensor, flow sensor, etc.