Cal Aqua Labs Double Check CO2 Checker for Aquariums Catnip It contains the famous Zoom

It  contains the famous Zoom Around the Room high-test organic catnip

soft mattress

Stronti+ contains all of the strontium required for healthy coral

vitamin and mineral content

Large:       26

Cal Aqua Labs Double Check CO2 Checker for Aquariums Catnip It contains the famous ZoomThe CalAquaLabs Double Check CO2 Checker for Aquariums is the only all glass dual compartment CO2 checker that allows you to compare the CO2 level in your aquarium to a standard reference. The CO2 indicator solution is kept in the top chamber, while the CO2 reference solution is kept in the bottom chamber. The color of the reference solution corresponds to 30 ppm of CO2, a level widely accepted for good plant growth in most aquariums. It's a one of a