Our SkipperLiner started taking on water last Fathers day, the result of many small holes in the steel hull, caused by stray current corrosion- which is not to be confused with galvanic corrosion. Stray current corrosion is the result of low DC voltage energizing normally grounded metal in the boat that's in contact with water. (or humidity outside water I'm finding out). And it is particularly destructive. The usual cause is bilge pumps, because if there's water in the bilge, the pump's hot feed will be in the water, and any current leakage will energize whatever the pump is grounded to, such as metal thru-hull fittings and, of course, outdrives.
The reason I bring this up is because I have 3 aluminum fuel tanks and an aluminum black waste tank in the SkipperLiner. The waste tank has a corrosion hole the size of a dime right on top. And my starboard 78 gallon fuel tank has a hole 9" from the bottom, that I've yet to see because it's hidden, but I found out the hardest way that it's indeed there-- And stray current corrosion is the source of both holes...
For this reason, if ever I have a choice of tank material for fuel, water or waste, it will be NOT be aluminum!