The EcoSytem 40 is the perfect solution for small tanks from 10 to 40 gallons. Set up a small aquarium in your bedroom, office, or business. EcoSystem 40 Specifications: - Supports 10 - 40 gallon tanks - No additional plumbing required - Great for beginners - 18in W X 4.5in D X 11.5in H - Requires 5 inches between back of tank and wall - Fits all glass and most acrylic tanks EcoSystem 40 Includes: - Refugium Tank - Skim Box