01-25-2011, 05:05 PM
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When i leak tested my tank, I put it on top of a large piece of cardboard (so that I could see where the leak actually was, judging by the wet spot on the cardboard) and I filled it up in increments. So I filled it up a quarter of the way, waited overnight, checked for wet marks on the cardboard, marked the water level with a post-it note tab, filled it up to the halfway point, waited a day, and so on.
this way you determine not only which seam the leak occurs at, but also at what level. no leaks for me!