Just to explain the sump a little bit. I have a 200 micron sock on the drain. I replace this once a week. Then I have the carbon on the hanger so that I can knead it daily (yes I like to cause needless work for myself). It is swaying because I have a Hydor 1400 pump in there keeping detritus from settling (that is sand you see at the bottom).

Then there is the protein skimmer, ATO, temperature controller, heater and return pump. And dosing pump tube holder.