sera CO2-Tabs plus (20 Tablets)

sera CO2-Tabs plus are convenient effervescent CO2 tablets that fertilize your planted freshwater aquarium, with no pressurized gas required. Each tablet releases about 100 mL of CO2, roughly 2,500 bubbles, to feed your plants for lush, healthy growth and vibrant color. They are made for the sera CO2-Start diffusion reactor, a simple system ideal for smaller planted tanks and easy enough for beginners. This tube contains 20 tablets. Pair them with our live aquarium plants.

Why CO2 for planted tanks

Carbon dioxide is the single most important nutrient for aquatic plant growth. Supplementing CO2 lets plants photosynthesize faster, grow fuller, color up, and better outcompete nuisance algae. sera CO2-Tabs plus make CO2 dosing simple and affordable for smaller aquariums, with no cylinders, regulators, or tools to manage.

How to use

• Place one tablet into the slot of your sera CO2-Start diffusion reactor
• Each tablet releases approximately 100 mL of CO2, which diffuses steadily into the water through the reactor
• Follow the dosage guide in the sera CO2-Start instructions, based on your tank size and plant load
• Replace tablets as they are used up to maintain a steady CO2 supply

Requires the sera CO2-Start reactor, sold separately. Ideal for freshwater planted aquariums up to about 120 liters, 32 US gallons. For freshwater use.

Specifications

Frequently Asked Questions

Do I need the reactor? Yes. The tablets are used inside the sera CO2-Start diffusion reactor, which is sold separately.

How many tablets are in a tube? 20 tablets, each releasing about 100 mL of CO2.

What size tank is this for? The CO2-Start system is ideal for freshwater planted aquariums up to about 120 liters, 32 US gallons.

Is this for freshwater or saltwater? Freshwater planted aquariums.