I wouldnt trust it. especially on the bottom 0.0 and if its a tall tank the question would be 'when will my tank fail' and not 'will my tank fail'. Also FYI ALL tanks fail at some point. whether its 200 years down the road, or in ohhhh 15 minutes tops. Most tanks wont survive a big earthquake unless there HEAVILY reinforced with concrete, 6 feet thick glass, etc. Even then the better question is still 'when will my tank fail' just imagine that giant watch up in the sky ticking and tocking the seconds til the failure of our equipment.