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So me and my wife are discussing how many aquariums I actually have and we are at an impasse. I currently have a 55 gal dt, a 20 gal frag tank and a 30 gallon freshwater aquarium. The 55 and 20 are plumbed to a 30 gallon sump. I am also using a 20 gallon as a top off container. She first said that I have 5 aquariums, counting the sump and top off as aquariums. I tell her that I only have 3. The top off tank doesn't count and the sump is a filter for the 55 and 20. She gave me the top off but says the sump is an aquarium because it has living creatures in it. She told me to post the question and she would agree with whatever the consensus was. So, is the sump considered an aquarium or am I right about it just being a filter system no different than say a hob filter? HELP!!