Marie,
I use a 75g for my sump, but mine is the short, wide version. I have it so that my first section (for my skimmer) is 16" long, the refugium center section is 26" long, & the last section is for my return pump & only 6". Since yours is an external return, you could add extra baffles in the last section to remove any bubbles. I have the water falling from the skimmer section into the refugium, then going under the baffle into the return.
Irene & I might be coming up to Powell River during Spring Break & I can help you build the sump & drill it if you haven't got it done by then. (if I can borrow the drill bit from my buddy).
BTW, I have my baffles roughly 6" from the top so there is leeway in case I shut off the return pumps, so my sump doesn't overflow.
Anthony
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