11-13-2006, 07:20 PM
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For a 46 gallon, there really isn't a good way to inject CO2 unless you get pressurized. That being said, you can make a DIY setup using 2 two liter bottles with a yeast and sugar mixture. Connect the bottles inline and feed them into your ladder. It won't put a whole lot of CO2 in your tank but it will help. For a 46 gallon you might need two of these setups to get enough CO2 to fight algae and to make a real difference. One at each end of the tank.
Now for CO2, you really need to get a KH test kit. Your KH needs to be 2-3 in order to prevent pH swings that could be dangerous to your fish. My KH is normally 4-6 degrees and I have never had a pH swing of more than .3 overnight leaving the DIY running all night. Even if your pH swings more than that the KH levels will prveent a lot of ill effects to your fish.
Before making any real changes, tell us a little more about your tank. Lighting watts, fertilizer dosing, plants, pH, KH, GH.