a Refugium is a place that provides refuge for the critters to reproduce. They
were origanlly designed to be above the tank and drain back to the main tank
via gravity so the critters dont have to go through the pumps and have their
exosckeletons for their boddies. Some people use in tank refugiums too. Many
people can not keep a refugium above the tank and then end up converting their
sump/wet-dry into a refugium.The term refugiun is used quite loosely these
days.. Many people are thinking that the macroalgae in the fuge is what makes a
fuge a fuge, but in reality th emacro algae is considered an algae scrubber..
Rod Buehler
www.asplashoflife.com