I picked up a skimmer and a 67 gallon tank from Lastlight (Brett)
Then I picked up a 90 gallon from the classifieds on this board
I’m going to use the 90 gallon as a display and the 67 gallon as a sump.
I want a display refugium in the sump. Digital-audiophile (Greg) gave me a 40 gallon that I planned on using to build a refugium and the baffles. When I measured the size that would fit between the skimmer and the return pump I realized a 20 gallon tank would fit perfectly without having to cut any glass. I purchased a 20 gallon, removed the frame, bottom and front glass, then siliconed the back and end panes into the sump.
Next step will be adding an overflow to the top of the refugium and baffles to the sump.