Fluval CO2 Indicator Set, 0.50 fl oz / 15 ml

The Fluval CO2 Indicator Set (15ml) is an essential tool for maintaining the perfect carbon dioxide balance in your planted aquarium. It helps aquarists easily monitor CO2 levels to ensure optimal plant growth and a healthy aquatic environment.

This easy-to-use drop checker works by changing color to indicate CO2 concentration in your tank. A blue color signals low CO2, green indicates ideal levels, and yellow warns of excessive CO2, helping you adjust your system accurately.

The kit includes a glass reservoir, suction cup, and indicator solution that lasts up to 30 days, making it both convenient and reliable for regular aquarium maintenance.

Designed for freshwater planted aquariums, this CO2 indicator mounts easily inside your tank and provides a clear visual reference without complicated testing procedures.

The CO2 Indicator Set performs the simple and important task of monitoring carbon dioxide levels in aquarium water to help you keep healthy live plants.

Feature

• Visibly changes colors to indicate low, ideal or high CO2 levels.
• Solution lasts up to 30 days. Replace monthly to maintain accurate performance.
• Conveniently mounts to glass aquarium walls.

What’s Included:

• 1 glass reservoir.
• Suction Cup.
• Indicator Solution.

Setup & Use

The solution changes color with the CO2 level in the tank: blue means low CO2, green means ideal, and yellow means too much. The glass reservoir mounts to the aquarium glass with the suction cup. The solution lasts up to 30 days, so replace it monthly to keep the reading accurate. It is made for freshwater planted aquariums.

Specifications

• 15 ml (0.50 fl oz) indicator set
• Kit has 1 glass reservoir, a suction cup and the indicator solution
• Solution lasts up to 30 days

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.