Observed arrival · 2026-09-13
Dial-In CO2, a Planted-Tank Gas Control Panel
A free aquarium calculator that turns tank volume, pH, and carbonate hardness into an estimated CO2 level and a cautious starting bubble rate.
Field notes
The tool combines tank volume, pH, and carbonate hardness to estimate dissolved CO2, then translates that estimate into a starting bubble rate and color-coded range. Its guidance treats the number as an operating estimate rather than a measurement: users are told to adjust by 0.5 bubbles per second, wait 24 hours, and retest consistently. The page also documents three ways the calculation can mislead, including phosphate-buffered kits and freshly drawn tap water.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue