Jon, One of the things I remember from the boating days on algae in diesel fuel tanks is water is the is the thing needed to grow it. We always added isopropyl alcohol to the fuel as that type will gather the water and dispense it. I'm told that is the only type used in piston type aircraft, not methanol as in brand "Heet". Maybe you could add that to your shopping list. And Xmas is coming for all of us. What a great gift !
AL
2005 Marathon XL II