The Neutro Drop Checker is designed to indicate the amount of CO2 in your planted aquarium. In order to understand the CO2 level, a colour change occurs within the drop checker.
This drop checker is sold on its own and requires Neutro Bromo Blue solution to work and needs to be purchased separately. See the better together deal (on the right) and save money when purchasing this drop checker.
- Turn drop checker upside down and fill drop checker bulb section 3/4 full of bromo blue solution (sold separately). You may find using a pipette useful here.
- Turn drop checker right way up (without spilling contents) and place inside aquarium so that it is visible. In terms of location, aim for 2-3" off the bottom.
- Within 2 hours drop checker will display a reading according to your CO2 levels. Green is the ideal colour, yellow is too much CO2 and blue is too little (adjust CO2 output accordingly).
Remember your drop checker shows your CO2 levels 2 hours in the past (essentially a delayed reading). Any changes you make need to be done slowly. In the morning you want your drop checker to be showing a green colour so it's quite normal to have CO2 coming on about 2 hours before the lights come on. If you are new to CO2, then carefully monitor your fish in the morning to check they are OK. They should be fine but always check until you become familiar with CO2 levels and how your livestock are.
Final thought. The big question you have to ask yourself if you don't know your CO2 levels, how do you know if you have enough? 95% of all algae related problems are linked to insufficient CO2.