I am thinking about upgrading my sump to make it easier to change the socks and keep the sump from getting mucky over time. I like this design. It's expensive ($439 + shipping). I was going to move the refugium to a separate 29G tank and keep the sump for mechanical and chemical filtration (socks, protein skimmer, GFO/GAC reactor, and biopellet reactor). I am thinking the dual 7" socks will mean I need to clean them only once per week. Any feedback?