07-07-2008, 04:05 PM
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I have owned a fish hobby shop for over 30 years and have found through past experience that if you correctly stock a tank that is smaller that, oh 20 gal, the plants will do just as well without CO2 injection as without. I agree that CO2 will help plants grow, because that is what they use to photosynthesis, or take in Co2 and "breathe" out oxygen. The fish do the opposite, and thus naturally the plants provide oxygen for the fish and the fish provide CO2 for the plants. I feel that, while CO2 will help, there are cheaper alternatives than a 300$ CO2 injection system that will do the same thing if you really want to add CO2 to a tank that, in my opinion, doesn't need any additional CO2 if any. There are cheap replaceable CO2 systems for 30 or so $, or you could hook up a paintball gun canister. I think that in such a small tank, Flourish Excel would provide all of the basic carbon that your plants would need, and that wouldn't be over kill like a full auto CO2 system would be, plus it would be a lot cheaper. Once again, That is my personal opinion and I have had many gorgeous 10 gallon planted tanks that used no additional CO2 other than what the fish breathed out. I must disagree with your last statement that injecting CO2 will prohibit or decrease algae growth. I think that it makes no difference weather there is or isn't CO2 to the algae. Sorry if there was any miss-understanding.