Iv noticed that sumps are more preffured to keeping an octopus simply because of its curiosity. I dont ever want one getting caught in a filter/skimmer...ect. So, when setting up a sump, all the equipment is connected with the sump instead of the tank and runs the tank right? Is there filters AND skimmers that manually set up for a sump...or can any type of filter or skimmer be connected to a sump and control the main tank? This goes for hydrometers, thermometers and any other maintanence in keeping them alive and monitered.