The inside of the RSM cabinet is 22WX18DX24H. I had Golds build the largest sump that would fit and give me enough room to get pumps in and out for maintenance 21WX17DX18H.
I decided to put the protein skimmer external so I could fit a larger skimmer (my skimmer is over 24 inches tall so wouldn't fit inside) and maximize the size of the sump.
Originally I was planning the RSM, sump and shallow refugium but found a used Nanocube 6 so decided to add on the speciman tank while I was doing all the plumbing. Easier to add it in now than to modify the system once it is up and running.
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vaporizer volcano