Was sitting here in my living room staring at my tank contemplating how long I'll have this tank running. It's my first and while I'm sure the guppies and neons I now have will be long gone in a couple of years, I'm sure I'll also be adding more stock as the years pass. I just wondered what's the longest anyone here has kept the same tank running. And also I'm hearing of old tank syndrome. What/when exactly do you do to spruce things up? Do you ever just drain all the water and replace substrate after a certain time? And I'm not talking about when there was an infection or bc you were buying or selling a tank or bc you decided to do a different setup/aquascape.