| http://www.w3.org/ns/prov#value | - a sump isnt required, but adds to the over all water volume of the tank, so the bigger you can go, the better. sumps also provide a great place to put equipment, such as heaters, skimmers, and carbon/phosban reactors. you can also include a refugium ( which i suggest ) in your sump that has a macro algae ( i suggest chaeto ) and a clip on work light with a 6500K full spectrum bulb. and finally her
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