Refugium???????

I is all edumacated and stuffs :hitting:
 
I thought that sumps were specifically made for filtration...using either sand or bioballs or whatnot. And refugiums were well...what other people said above. And that some people build an all in one and have both?
 
Actually, more and more are asking themselves "to sump or not to sump." Refum, on the other hand, is having its day.
 
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