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40g breeder overflow box

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Your sump size is a piece of the puzzle as you don't want too much flow through there or you may get bubble problems.  Are you planning on running anything else off your return pump like reactors?  Lastly will you use powerheads in the tank for flow, so the return is purely for filtration?  Not knowing the answers to the below, I am guessing you will need something that delivers around 400 to 500 GPH after head loss.

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It is going to be a 30 gallon tank for the sump. I don't plan on running anything off of it. I will have power head if the flow isn't enough by the return pump but I am guessing the return will not be enough.

Thanks for the help

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I used a ball valve to open and close the flow from my return on my frag tank. I was running a rio 2500 and my guess is that I was restricting about half of that. It was easy and cheaper then buying a dc pump and I could adjust it at any time.  

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20 hours ago, Nanoreef13 said:

I used a ball valve to open and close the flow from my return on my frag tank. I was running a rio 2500 and my guess is that I was restricting about half of that. It was easy and cheaper then buying a dc pump and I could adjust it at any time.  

 

Yeah i did that on my 180. 

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