This formula is for a 55 gal so I am sure you can use it. I use two 2 liter bottles and the Hagen Ladder system for 20gal tanks.I wasn't aware that baking soda could be used...what advantage does it have? Also the recipe you gave, would that be sufficient for my 54L tank? And as you probably guessed I wouldn't have a clue on your recipe failures due to my lack of experience...