What is flow?
Flow is the water movement inside your aquarium. It is often referred to by an amount such as litres or gallons per hour. This is calculated by taking the output from powerheads or wavemakers in your aquarium. We use powerheads or wavemakers to push water around inside the aquarium to create a 'flow'. Many corals and livestock rely on flow in order to survive and thrive so the type of flow is just as if not more important than the amount. When considering whether your flow is adequate in your reef look for dead spots where detritus is settling and adjust your wavemakers to prevent these dead spots from occurring. We're trying to replicate the ocean so consider waves crashing on the reef and how much water moves around with every wave, this is what we're trying to copy albeit on a smaller scale.
Have a look at wavemakers and powerheads here;