I'm using a tank that sat under the house for maybe 20 years. 4 foot. I just siliconed an extra strip of glass across the top for extra support, filled it up outside till it was overflowing and left it for a week to make sure it had no leaks, gave a good look at the silicone joints, all good and now I've been using it for several months with no prob's. I have two 6 foots that I've been storing for a few years now that I plan on using..... eventually, that I'm not too worried about either.