CO2 Aquarium System

 CO2 Aquarium System adds CO2 to the aquarium water. What is this for? I thought fish needs plenty O2 instead of CO2. The answer to the question is CO2 is great for aquascape aquarium or an aquarium with lots of live plants in it. Plants use CO2 as one of important nutrient. during the photosyntesis, plants uses light and CO2 to produce food they need for growth.
If there are fishes in the aquarium, then the CO2 supply might be sufficient from the waste of fish respiration. However,  large aquarium with lots of plants have much greater requirement for CO2 than the fish can provided. This is when we need to add CO2 to the aquarium.
CO2 can be put into the aquarium in there way

1. Bio system, in this methode CO2 is produced as a byproduct from fermenting sugar.The accumulated carbon dioxide travels through a reaction chamber and is then mixed with the aquarium water by means of a diffuser or a powerhead.
2. mechanically, this involves a tank of CO2 and let it bubbles the CO2 into the water.
3. chemically  or electrolysis system .this system uses block of carbon which is electrolysed  and relesease CO2.

there are many CO2 system that is avaiable in the market. There are even lots of DIY tutorial for supplying CO2 into the aquarium. Whichever technique used, it is most important to keep an eye for the level of CO2 in the water. high level CO2 in water is toxin.
measuring CO2 level in the water can be accomplished by watching the pH level of water. CO2 will lower the pH, makes it acid. Make sure that pH is not dropping under the level of 6.

Another tips while applying CO2 is  not to turn on any air bubbles. this simply because CO2 is easily released from the water and having a massive water flow to the surface by air bubble makes the CO2 in the water easily escape to the atmosphere.