Thank you. You don't use excel do you? I thought I remembered seeing you talking about using something different that was much cheaper. I ask because I use DIY co2 and thinking about switching to liquid. I know the DIY co2 is good enough for my 10 gallon but I don't feel it is very constant. The amount of co2 I produce seems to drop off rather quickly and I will admit I am not too quick about mixing up a new batch. If I were to use liquid I would know the amount would be consistent.