CO2 Drop Checkers

Monitoring and maintaining the correct CO2 levels in a planted aquarium is vital. The drop checker is a reservoir for an colored fluid that indicates whether there is too much, too little or the correct level of CO2 for plants to grow and that is a safe level for the fish. 

How to install a CO2 Drop Checker

For glass models, invert your drop checker and fill the reservoir up half way with CO2 drop checker indicator solution.  On models such as the UP Aqua Long Term remove the plastic cover and fill to the line. 

Using the suction cup (or hang if using a hanging type), submerge the drop checker into your aquarium water and attach it to the aquarium glass sides for cushion cup models.

Based on the concentration of the CO2 in the water, the color of the solution will change.

Check the color. Blue = too little CO2 concentration, Yellow = too much CO2 (dangerous levels for fish), Green = optimum levels for plants and fish. The color has a 1-2 hour delay. So what you are reading is the CO2 concentration roughly 1-2 hours ago.

Based on the reading, adjust the CO2 bubble rate using a regulator if required and or the needle valve. Wait a 1.5 to 2 hours for concentration of CO2 to change and check your readings.

A general guide is  between 1 – 3 bubbles per second through the bubble counter is usually enough to get a green reading on tanks up to 50 gallons. Adjust this according to the tank size and what the drop checker is indicating.

If there are problems getting a reading the CO2 may not have been diffused enough in the water. Try adjusting or increasing tank circulation or re-positioning the diffuser towards the direction of flow to aid diffusion rates. Alternatively, positioning the diffuser near the filter inlet will allow the bubbles to travel through the filter, increasing the effectiveness of CO2 diffusion. The goal is to keep the bubbles in the water column for as long as possible to increase the effectiveness of CO2 diffusion in the aquarium water. Make small adjustments until you get a green reading on the drop checker. Be careful not to go too high as it can harm the fish.  If this happens add aeration with an airstone via air pump and temporarily stop CO2 injection.

CO2 Glass Drop Checkers & CO2 Indicators

• Most favored hand-blown glasswares in the aquatic world
• Allows you to monitor the CO2 level inside your aquarium
• Designed to hang on glass
• Easy to use

VIV’s hand-blown Glasswares are the most favored in the aquatic world offering an outstanding elegance to any aquarium. Designed with an emphasis on functional beauty, each VIV glass piece is handmade in China by skilled glass workers. The pieces are formed from crystal clear borosilicate glass, the same material used to make high end lab equipment. Japanese glass craftsmen carefully hand finish each VIV part to the highest standards with smooth edges and attention to the smallest details.
Use with UP Aqua CO2 Indicator Solution Refill for Drop Checker