The Uniquarium Pentagon defends you and your fantastic fish from scum! They get extra freedom to see and be seen while you enjoy more viewing angles. The back sides are at 90 degrees perfect for corner applications. This Pentagon comes with everythin g you need for fresh or salt water: high-capacity Bio-Fil 3-way filter Rio high-flow powerhead and more maintaining perfect environmental peace without ugly tubes pumps or hoses. Choose your favorite size and tint and start the five-sided fun