I took down a 240 after about 20 years because of a move. I took down 3 60 gallon tank frag system a little before that that was 7 years old. I moved my 29 gallon at the same time. It has been set up for 12 and took it down a year later after my 300 got established and stable. I moved the corals, calm, shrimp and fish to my 300. I have fish and corals I have had for 20-23 years. BTA anemones almost as long. I sold my very first anemone from my fist tank 6 years ago or so. I still have the first clown that used to hose it that is 23 years old at least.