Our performance power filter are designed for nanos, betta aquariums, and small desktop aquariums up to 4 gallons. The dual stage filtration design provides biological and mechanical filtration for an optimal aquatic environment. Plug and play design for easy installation and simple maintenance. Promote a healthy aquatic experience with our ultra efficient filtration system. We are committed to bringing consumers the highest quality products for the most competitive prices. We value your support and want to provide 100% satisfaction, so please feel free to contact us if you're not 100% satisfied.