nanocubesponge
Nano Cube Sponge
Replacing your sponges every month on your JBJ Nano Cube is a good idea  Sponges are important to keep ammoninia and nitraties-nitrates @ bay in yours altwater or freshwater aquarium - tank. Replacement

Many of our Replacement sponges  for all of the nao cubes we offer ship in a variety of sizes.

Get the correct one for your aquarium

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NANO CUBE SPONGE
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nanocubesponge
 This is the replacement Sponge Fliter Media for the JBJ Nano Cube.
Designed for the JBJ Nano Cube aquarium filter and other filters requiring a sponge block. The nano cubesponge design provides mechanical filtering of solid waste matter from your aquarium water. This will also prevent early clogging of other filter media in the filter path. Sponge Filter Media should be replaced every 2 months. Alternate the replacement of the Sponge Filter Media with Activated Carbon Media to maintain biological filtration.