Your tank is predrilled now we need to know how big are the bulkheads. If the pump is too strong then the water will not drain quick enough and it will overflow. Here's what you can do if the pump is too strong:
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To avoid too much flow to your tank, in case your pump is too powerful, you can put a "tee" in your return plumbing, and an elbow pointing straight back down into your sump. Then you put a ball valve on that. If the valve is wide open, the majority of your water will go straight back into your sump. The more you close the valve, the more water goes up to the tank. This is the best system, because your pump will never feel a restriction and it won't shorten the lifespan of your pump.
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