Hydroponic system? Yeah 2.9 gallons is perfect actually. The "problem" with running high GPM pumps is that they will create high pressure and this eventual pump failure. I solved this problem by just creating a simple pressure relieve out of a hose t and flow valve. It was suggested to me that I keep the motor cool and so I bought a cooling fin sleeve that fits over the pump. I haven't had any issues with it so far.