Hello, just wondering how long you have had your tanks? I have had my 75 gallon freshwater on the stand that came with it for 13 years now. We have to move it to it's permanent location (we had to move it because of repairs that needed to be done to the floor) but we are wondering if we should look into replacing the tank and stand. Is 13 years old considered old? The tank is in great working condition and does not show any signs of leaking, all seems stable. What have been your experiences for tank age? Thank you!