Maybe some carification will help. The show tank will gravity feed the sump (90g) and the refugium (180g). The refugium is a 180g with an overflow built in which will aid in the gravity feeding of the return area 40-60g tank (sitting between the fuge and the sump), which is also gravity feed from the sump also. The real issue I am pondering, should i have baffles in the refugium to direct the water in a path or just have a open area? Just was wondering if there should/would be any difference between small refugium design and large system design?
TIA,
Jeff