Aqueon Betta Filters Volcano One Size Features For small betta habitats like bowls and aquariums up to 3 gallons Carbon and sponge cartridge should be replaced monthly for optimal performance Air bubbles provided added environmental enrichment and oxygen in betta habitat Requires air pump for operation (sold separately) Air operated betta filter with volcano decoration helps improve water quality and clarity for a healthier habitat Included: Betta filter with volcano, suction cup base, air tubing and suction cups, air adjustment valve, check valve, instructions Fast and Free Shipping You're already purchasing the item. Why pay additional for shipping, especially slow shipping? We get your order shipped out within 1-business day and delivered to your doorstep as quickly as possible. Competitive Pricing With our dynamic pricing model, our prices are always competitive. Our prices are some of the lowest that you will find on the internet. Rest assured that you're getting a good deal when purchasing with us. 30-day Money Back Guarantee We are committed to making sure that you leave this transaction satisfied. If you're unhappy with the product for any reason, you may return it back for your money-back or a replacement within 30 days. No questions asked!