The JBJ 24-Gallon Nano Cube Aquarium is the aquarium of tomorrow with its super sleek cube design that's unlike any other tank you've seen before. It has a chic S-shaped stand to complete the whole look. But this aquarium is not more than just aesthetics. One of its features is a built-in filtration system that is fully integrated to the tank. There's no need to purchase a separate filter, unless you want reinforce the system by adding more (although that is not necessary). Nevertheless, you can still stick to the built-in filtration system. However, just like any filtration systems, the filtering sponge gets clogged up in time. Sponges can be washed for re-use, but it must eventually, it must be replaced. Luckily, the JBJ 24-Gallon Nano Cube Aquarium Replacement Sponge from Petstore.com is readily available in the market, and it is also very affordable, too. The JBJ 24-Gallon Nano Cube Aquarium Replacement Sponge effectively captures unwanted particles such as germs and dirt particles. If you want your aquarium's filtration system to work optimally, regularly replacing the sponge is an advisable idea. Leaving the sponges unchanged over long periods of time could lead to growth of harmful bacteria that can contaminate the water and harm the fish .