Your maxijet will push about 50GPH, turning over the water in your sump 2.5 times per hour, which is not much. 1/2" PVC can easily handle that much flow. You will need to add additional flow in both your display and sump (if used as a frag tank). It would probably be more efficient to use a bigger return pump (300GPH+) to contribute to your flow rather than extra powerheads which will generate a lot of heat.
Regards,
Nevin
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