*Appropriate CO2 key to maintaining the ecological balance in the aquarium. Excessive CO2 will hurt your fish， too little CO2affects plant growth. The CO2 monitor products allow you to directly monitor the aquarium's CO2 content， handmade elegant styling， so you can not only facilitate observation adds to the texture of the aquarium. Confirm the tank by the color of the liquid CO2 concentration. According CO2 addition and the amount of aquatic plants photosynthesis， the color change of the liquid is blue， green， yellow * ( based on test solution may be ) . AsCO2 amount of reference.

Maintaining the appropriate CO2 level is critical in a planted aquarium. Too much CO2 may harm your fish， whereas too little CO2 decreases plant growth and allows algae to take over. VIV Design CO2 checkers allow you to monitor the CO2 level inside your aquarium. Handmade from the highest quality borosilicate glass， the CO2 checkers are an elegant addition to your planted aquarium.

Explanation:

1)    was dropped test solution;

2)    direction as shown in FIG inclined， so that test solution flows into the test solution zone;

3)    as shown in the body of the rotary air inlet downward to prevent rotation during the test solution flows;

4)    The body hung on the outer wall of the tank， the air intake is below the level you want;

5)    test solution color observation method according to the instruction of the test solution， contrasting color card.