You might be able to Finagle' one using the tank you've got. You need three sections so redesigning the sump you have could be an option. the first section will have both the intakes from your tank and your protein skimmer. the middle section will be your refugium and the third section will be your return. you only need the first and third sections big enough for you equipment and that's it. you'll want as much refugium as possible. just put a heftly layer of sand in there, some live rock rubble and some green stuff, oh, and you can get some pod starter stuff too. you'll have to ask around for that. Ebay has plenty of Macro and pods to get you seeded.