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Consult the user manual and take the time to understand the particular flow pattern your powerheads can create. Some pumps are directional meaning you can angle the flow while others are not. Some powerheads allow you to change or adjust the flow pattern with nozzles or shroud accessories which can then dictate the best mounting location/position.
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The facts are, you will move the pumps, more than once, throughout the life of your tank. This can only be achieved with effective pump placement. While it is true that tanks containing SPS corals do require a bit more flow compared to tanks containing soft corals and LPS, in either case, you want to get water moving in every nook and cranny of the tank.
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The ultimate goal is to create ample movement throughout the entire volume of water in your display, without creating high-powered streams or allowing for areas of little to no flow (dead spots). The proper placement of those pumps is equally as important as choosing the right pumps when it comes to achieving sufficient internal flow in a reef tank. Creating this flow has a number of really important benefits, especially in reef tanks containing corals. Powerheads are special water pumps designed to create internal flow inside your aquarium that replicates the natural currents and wave motion of the ocean.
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