11-12-2010, 01:35 PM
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well if hes looking at low gph, a air pump to move water is a much safer option than installing a motor. If hes looking to move a lot of water, its possible to find hollowed out driftwood or resin and mode the interior to work like a HOB inside the tank where the motor pulls water into the log, and pushes it through filter media to be expelled wherever the output is. Its a matter of risk and design in using air would be a different design, much easier, than a motor where u need to figure out how to make a waterproof compartment that will allow you to switch out the motor if it fried. Using a submersible pump would work as well, but u still need to factor in how to seal one end for only input or the water will recycle itself and you wont be cleaning ur water as much.