
I still don't understand how it works. I use it on a 40 gallon aquarium. It is located on the opposite side of the CO2 atomizer. First I set the CO2 to 1 bubble per second but to no avail. Then it was increased to 2, 3 and 4 bubbles per second and left overnight, but still no color change was observed, indicating the amount of CO2 in the water.

Fish Water Quality API Test Kit
9 Review

π§ͺ Enhanced API Replacement Test Tubes with Caps - Ideal for API Freshwater Master Test Kit - 24 Count Box
8 Review

FUNSWTM 7 in 1 Aquarium Test Strips: Accurate Water Testing for pH, Nitrite, Nitrate, Chlorine, GH & KH Levels
8 Review

π¦ Comprehensive Water Quality Analysis: ICP 33-Elemental Test Kit - Single Sample Kit
9 Review

Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review

Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review

π§² Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review

Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review