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You can supplement with excel, but that is not the same thing as Co2, some plants don't like excel and will "melt" when you use it, and other plants take a while to get adjusted to it. But if you were going to spend money on the excel, if I were you, I would just upgrade to a cheap paintball setup, there are some regulators in the TPT sales section for around $40 I believe and then you will just need a paintball canister, you can get these used online for about $10, then another $4 to fill it. I am running a paintball set up on my ten gallon aquarium at around 2-3 bubbles per second and if my math is correct it should last me a two to three weeks worth of use, and more if I turn it off every night. I used a paintball setup on my 75 gallon display tank for 2 years and it still works well, have recently moved it to my ten gallon when I upgraded to a full size regulator and 20# co2 canister.
There was a thread about this earlier today about increasing the bps, it was suggested that they add more sugar, I have not done DIY co2 in a long time but it would make since that more sugar would mean more bubbles, and for a longer period of time. When I was doing DIY co2 I worked it out to where it would cost me more yearly to continue to use DIY co2 than it would to upgrade to a paintball system.
There was a thread about this earlier today about increasing the bps, it was suggested that they add more sugar, I have not done DIY co2 in a long time but it would make since that more sugar would mean more bubbles, and for a longer period of time. When I was doing DIY co2 I worked it out to where it would cost me more yearly to continue to use DIY co2 than it would to upgrade to a paintball system.
