Hey all, the other day my wife found some containers at Hobby Lobby that work even better than the glitter ones i found. These are used to mix and store paint. I used 1/2 in. thin wall rigid tubing for the centers. I used Goop adhesive, aquarium silicone will work but i've had better more consistent results with the Goop. The best part is the caps fit very tightly so no gasket is needed. I think the video is fairly self explanitory, if you have any questions please dont hesitate to ask.


YouTube - Aquarium DIY CO2 Drop Checker


~Andy