My sump has 2 chambers right now, one with my pump and a larger one. I was thinking if I put a divider in the larger chamber thus making it 3 chambers. The first chamber would be big enough to hold my overflow lines coming from my tank and my skimmer (chamber size-12W x 9.5L x 16H). The water would then flow over the divider into the 2nd chamber (12W x 11L x 16H) where I was thinking the refugium could go then flow over the divider into the pump chamber. When my tank is operating, the water level is at 10 inches and when I turn it off the water that siphons back into the sump gets it up to about 12 inches so I have about 4 inches of safety before it runs over. Would this not work? Forgive my novice questions but I'm learning as I go and your talk got me jazzed about refugiums!!