You could just open all the walls, leaving only 10/9 gallons in the corner tank. However, it's more efficient to drain it in three stages.
There are many variations on this solution, but they all leave 1/3 of a gallon.
Once you've seen this solution, finding the best solution for 16 tanks or 25 tanks is quick work--unless there's a more complicated solution that I haven't found.
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