I've email questions but no reply yetDo you mean why the tank was leaking? Hard to say without seeing the tank, could just be very old silicon, sometimes tanks that are not level will leak (too much weight on one side, as you say), sometimes they are just not sealed properly by the manufacturer.
Get some pictures of the leaking spot, and some of the silicon all around (as may be more leaks in the making if there is already one)