What is a......?

[mhhauser]

I have heard the word refugeum mentioned a lot here on RC, and from what I can gather it is like a mini aquarium in your sump and it has something to do with cleaning your water. Well anyways I wanted to know anything about it or any articles.

Another question is Are the neccesary?

 

[Pandora]

mhauser: identical questions answered here--

http://www.reefcentral.com/forums/showthread.php?s=&threadid=759464

They are not "necessary" but they do a great job and are highly recommended.

 

[AllenFord_SC]

And here are 54 different threads on designing one:

http://reefcentral.com/forums/searc...=6328584&sortby=lastpost&sortorder=descending