Help on return pump speed

Tinklez

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Hey everyone, I have an IM 50 AIO and this was the pump it came with, a might jet 538 GPH return pump.

What speed should I set it to? Should it be maximum to push out as much water as possible?

 

Rocks reef

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I would start it at 50% and see who the inhabitants of the tank respond, if you have critters already.
 

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