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rated at 650 gallons each
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for a tank that size or gallons per hour? The rule of thumb for small tanks is flow at least 5-10 times the size of the tank per hour. Spray bars are good for spreading out the output flow and slowing it down. The more you churn the surface, the more air exchanged with the water. More oxygen is good for fish, but you lose CO2.
Two identical filters is a good idea.