This is a 10 gallon sump for a 20 gallon long tank. I have the tank, skimmer, and return pump. My main questions are is it better with a smaller sump to go with 2 chambers or 3? I have some divisders from melev's reef that are cut and ready to go, but I'm not sure as to the best compartmentalization. How much space does the skimmer need? I was thinking a skimmer space, a small center space primarly for ATO sensors and return, and then the baffles for the return pump. I have ready not giving the return pump enough room/volume can lead to some issues.


