| Replacement Filter Cartridges Medium Pack of 12, 12 CT An aquarium is like a little slice of the ocean right in your living room, but sometimes keeping it healthy and crystal-clear can be a bit of a challenge. That's why we're stoked to introduce you to our Aqueon Replacement Filter Cartridges in a pack of... ... more Replacement Filter Cartridges Medium Pack of 12, 12 CT An aquarium is like a little slice of the ocean right in your living room, but sometimes keeping it healthy and crystal-clear can be a bit of a challenge. That's why we're stoked to introduce you to our Aqueon Replacement Filter Cartridges in a pack of... Petco.com | | $29.95 go to store |