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Activated carbon insert for Zoo Med's 501 External filter. Zoo Med's
activated carbon filter media is made from the highest quality carbon
available for superior absorption of ammonia waste products produced by
captive turtles, amphibians, or aquarium fish. High ammonia levels can
be deadly to amphibians and aquarium fish and will cause eye problems in
captive turtles. Activated carbon is one step in reducing ammonia in
your terrarium or aquarium. We also recommend weekly water changes of at
least 20%. When adding tap water (after a water change) make sure you
add Zoo Med's Reptisafe to remove chlorine and chloramines.