I think you should just replace it, that way you won't be worry when it will leak or fall apart. That way you can sleep better and like you said tank that size is cheap. It is a lot easier to move compare to a 100gal tank, which I just did move my tank 115 miles and I can tell you it is big pain in the behind. Good luck.
[LIST][*][COLOR=orange]What would you do if you know exactly how to win?[/COLOR][*][COLOR=orange]Always pay your self first.[/COLOR][*][COLOR=#ffa500]Win with emotion, validate with logic.[/COLOR][/LIST][COLOR=blue][/COLOR]