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This is pretty simple. If I knew your sump design. Let's say you were doing a skimmer/return/fuge design.
What height maximum does your skimmer require if you use an in sump skimmer? For example, most are 8-9". Make the first baffle that height. Then the next baffle would be a hanging baffle so that water travels under it. You would hang it about 1.5" above the bottom and it can be any height reall as long as it's taller than the first baffle. 10-12" is fine. The next baffle should be the same as your first baffle, and this will be the last baffle between the skimmer and return.
Next, the fuge. From left to right we have done 3 baffles thus far. Usually people make the fuge a little taller, say 12-14" This way you can have a 4-6" sand bed and still have 6-8" of water volume.
Now, if you don't plan to do this set up then I did this all for nothing. Anyways, I hope it helps you get the point.
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Frank
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