Shop from the world's largest selection and best deals for CO2 Aquarium Water Test Kits. Shop with confidence on eBay!
Using modern kits like fluval co2 system 88, You can inject co2 to an aquarium 20 gallons or larger. Using a DIY co2 kit you can inject co2 to an aquarium of any size, but in small amounts. Your kit should be on all day as long as your lights are on. It WILL NOT harm your fish at all as long as you have water movement and lot of plants.
DIY CO2 Aquarium System kits are very popular, cheap and easy to operate, but how do they compare to canisters of pressurized CO2 like a Soda Stream bottle? In this comparison video, I give my verdict, in a Knockout Decision. DIY is Fun to play with, but it doesn't really deliver consistent, reliable results. Excitement followed by disappointment is my experience with it.
CO2 and O2 test kits - Aquarium Advice - Aquarium Forum Community
CO2 Systems - Doctors Foster and Smith