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There is usually no need to put co2 in a FISH tank.....Fish consume oxygen and give off carbon dioxide (CO2)...just like YOU do. The main reason for putting CO2 in a tank is if you have GOBS of plants and HARDLY ANY Fish....as it is PLANTS which need CO2 to grow. If you don't have enough fish to feed the plants enough CO2, then add a couple fish. This is hardly ever a Problem. HOWEVER:::: there is a Doodad that you can buy for your plant aquarium which will add more co2. But that's not too good for your fish, assuming that you have them...

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16y ago

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