By the time I add gravel,and a couple of plastic plants, the most water this "two gallon" tank holds is one gallon plus one cup. I have been using conditioner etc. based on a two gallon water volume. Today I realized it will not hold two gallons and am wondering about adjusting the various conditioners: dividing the amount to treat just one gallon of water. Is that what I should do? I have just one beta male right now. There had been a danio in with him. [color:"black"] [/color]