Sump is an old 3 foot tank and uses acrylic dividers which I cut and glued in place.
I went for a four chamber design with the first chamber being the return from main tank. I also sited the skimmer and heater here. Second chamber is the live rock rubble for extra denitrifing. The water enters at the top and then out through the bottom into the next chamber - the refugium. This has a two inch base of reef bones (later converted into DSB) and Caulerpa for phosphate removal. The water then enters the fourth and final chamber via overflow where it is returned to the main tank using a RIO pump (3000+ litres per hour)
Nice & dirty! Picture taken just after start up.
Slightly later pic
Here you can see three types of macro algae in the refugium
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