1 PH drop and 20 ppm CO2 | UK Aquatic Plant Society
Drop checker blue | UK Aquatic Plant Society
JBL Water Test Set, For freshwater aquariums, ProAquaTest CO2-pH Permanent : Amazon.co.uk: Pet Supplies
Why is my co2 drop checker constantly blue? I am using the JBL Permanent Co2 plus pH Aquatest. The instructions indicate that you add 35 drops of the provided tester liquid into