sump

[Jack]

Rinse out the filter floss really well at least once a week to prevent the filtered particulate from decomposing, causing Nitrate.

A refugium is a seperate tank (or seperate area of the sump) that is setup to house lit macro algae's and/or "live sand" to aid you in overall tank filtration. They are very easy to setup. Try and google some pictures and descriptions and you will get some good info that will get you started.