I am running a 40 gallon system with a 10 gallon DIY sump. Sump is configured based on what I saw commercially when I was starting out. Order of flow is: filter socks, then skimmer section, which includes heater and carbon reactor, then chaetomorpha refugium, then return pump section, which include ATO and doser. The water most free of particulate matter is just past the filter socks. It seems to me, unless I am missing something, it would be better if the most particle free water was entering my tank. I would rather have detritus in my refugium than in my display tank. This is dramatically apparent whenever I try to clean my refugium, or even just trimming the chaetomorpha. Boatload of debris heads right into my tank. Wouldn't it be better if the filter socks were just upstream from the return pump? I would appreciate your thoughts.