sump chamber height question?????


New member
how do i know what hight to make my chambers in my sump.

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?