CO2 Fertilizer Tablets for CO2 Diffusion Reactor
Sera CO2-Tabs Plus are designed to be placed into the designated slot of a CO2 diffusion reactor. When in contact with aquarium water, each tablet releases approximately 100 ml of CO2, equivalent to about 2,500 counting bubbles.
Product Specifications
| Parameter | Value |
|---|---|
| CO2 Release per Tablet | Approx. 100 ml (2,500 counting bubbles) |
| Usage Method | Place tablet into the reactor slot and submerge in aquarium water |
| Compatibility | Designed for use with CO2 diffusion reactors |
FAQ
How many counting bubbles does each CO2 Tab release?
Each tablet releases approximately 2,500 counting bubbles.
Can the CO2 Tabs be used with all types of aquarium reactors?
These tabs are specifically designed for use with CO2 diffusion reactors and may not be compatible with other reactor types.
Is there a recommended frequency for replacing the tablets?
Please contact customer service for information on replacement frequency.

Dylan Miller –
The CO2 Tabs work reliably and provide consistent CO2 levels in my aquarium. I noticed better plant growth after using them regularly. Easy to insert and no mess in the reactor.
Katherine Butler –
Good performance for maintaining CO2 levels. The bubbles are steady and the tablets dissolve without leaving residue. Works well with my existing reactor setup.
Fiona Coleman –
I’ve used these tabs for several weeks now and the plants are thriving. The release rate is consistent and the process is simple. No issues with clogging or uneven bubbles.