sump chamber height question?????

HEADCHEF1971

New member
how do i know what hight to make my chambers in my sump.
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SEE THE PIC. the refugium is about 1 1/2 inch from the top , is that ok .
the return pipe is in an area of about 8x9x12 is that ok?
or do i not go all the way to the top with the baflles and the ref. because in case my pump goes out the water has a place to go?
 
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