You could use 2 rubbermaid containers (base the size on your main tank). You'll need some pvc piping to make piping , then you want to connect the 2 bins with a piece of pvc piping, pok some holes in the pvc coming into the first bin. That bin will contain your dsb and chaeto or crushed liverock.. Then your second bin will have the protein skimmer and return pump. I know it sounds confusing but I can take some upclose pics of mine for you and post them later tonight. I prefer the rubbermaid method because you can disassemble it and remove for whatever reason, if you have a tank refugium, you can't remove it without emptying/moving the dt