Yes, don't use any pH regulator. Test your water first (pH, GH and KH). I prefer using 2L soda bottle instead of hagen canister. I use it with a Hagen ladder in my 10gl and get about 35ppm of CO2. Another good thing is that you can prepare a new batch in another bottle before the other one ran out so you'd get a consistent CO2 level. If you only have 1 Hagen canister, you may sacrifice one day without CO2 every time you change the solution.