This is a pack of 3 CO2 refill canisters intended to be used with the Tropica Plant Growth System 60 (sold separately).
"Most aquarium plants do not thrive without CO2 fertilization - but algae does! So without extra CO2, your new plants can suffer and algae will take over your tank.
-A simple and inexpensive way to supply extra CO2 to the plants in your aquarium
-Easy to install, use and maintain
-Suitable for starter-sets, where even small amounts of extra CO2 will make a positive difference for the plants"
CLEARANCE item; box may show signs of water damage, but the canisters are intact, brand-new, and ready to use.