sump for 300 gallon

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#1
So I just got a new 300 gallon tank and I am doing the preliminary stages of setup for a reef tank. The biggest tank I had before was 110 gallons so this is much bigger than anything I have done before. I know that I am going to do a refugium and a protein skimmer. What other things do you think are essential to put in the sump system to maintain a healthy reef tank of that size?
Thanks
 
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