refugium?

[bj5z25]

what exactly is a reugium and what is its purpose

 

[Brenden]

Most people have them in a sump area under their tank instead of on the back but it mainly depends on the size of your tank. this article will explain it. http://www.aquariumadvice.com/showquestion.php?faq=2&fldAuto=33

 

[saltcreep1025]

added water volume (the best filtration is dilution)
caulerpa for nutrient exportation
haven for pods to grow
place to put unsightly equipment
added circulation
thats all i can think of, but it goes on and on...