That's how I build my sumps. One big skimmer box section for downflow from display, water overflows into big refugium section, then goes under another baffle to a small return pump section. If the sump is 4', then I would go 18" for skimmer box, 2' for the refugium section & 6" for the return pump section (or have skimmer box & fuge same size - 21"). Only 2 baffles needed and lots of room for everything. You can add some egg crate or mesh to cover under the second baffle to keep small inverts and such from crawling into the return pump. I grow Prolifera and chaeto in mine, with lots of extra rubble and even a removable deep sand bed in a tupperware container (about 7" deep).
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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