The Neutro Drop Checker is designed to indicate the amount of CO in your planted aquarium. In order to understand the CO level, a colour change occurs within the drop checker.

Drop checkers are the only way to monitor CO levels on a daily basis with high accuracy. This drop checker requires Neutro Bromo Blue solution to work and needs to be purchased separately.

WIthout a drop checker you are guessing your CO levels. This means plant growth will be sporadic and undesirable and this is why drop checkers play an important role when injecting CO2 into a planted aquarium. Drop checkers are very easy to use and start monitoring the levels immediately but always have a 2hour lag.

Directions to use:

1. Turn drop checker upside down and fill drop checker bulb section 3/4 full of bromo blue solution (sold separately). Use a pipette if possible.
2. 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.
3. Within 2 hours drop checker will display a reading according to your CO levels. Green is the ideal colour, yellow is too much CO and blue is too little (adjust CO output accordingly).

Key Point:

Remember your drop checker shows your CO 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 1 hour before the lights come on. If you are new to CO, 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 CO levels and how your livestock are.

Final thought. The big question you have to ask yourself if you don’t know your CO levels, how do you know if you have enough? 95% of all algae related problems are linked to insufficient CO.