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			I'm pretty frugal when it comes to money.  I don't know your situation but you are doing your own labor and you want to do a used tank, do it.  You will be better at doing it again when it fails.  This is not a fun job.  You won't get that much better at doing it the second time around.
 If you can afford the new tank.  Install it and put this situation to bed.
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