Activated Carbon

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For fish I just have a couple of perc clowns and a Chevron tang. For carbon I just bought a pellet off of Ebay for my pond that I never ended up using.

10 lbs Activated Carbon in 10 Media Bags for aquarium fish pond canister filter from aquatic.hobbyist

Here is another picture of the box. The drains from the tank are at top and go into a chamber that overflows in the box with the carbon and all the water flows through the carbon in a bag in the box. The pellets are in a black mesh bag that came with the carbon.