AQUATOP MaxFlow X-Cross DC Wave Makers Designed for advanced hobbyists and professional reef keepers, the MFX-40 delivers up to 4,000 GPH of customizable flow, effortlessly simulating the natural currents and surges found in ocean environments. MFX-20 boasts adjustable flow rates from gentle currents up to 2,000 GPH. Fine-tune your aquarium’s circulation using the external LED controller, selecting from five distinct wave modes and multiple intensities to keep your corals thriving and your water quality high. High-Volume Output: MFX-40 Delivers a flow range from 570 to 4,000 GPH to accommodate larger or more complex setups. MFX-20 Delivers an Adjustable flow from 320 to 2,000 GPH for perfect circulation. Versatile Wave Modes: Five unique flow patterns let you create natural surge conditions. Intuitive LED Controller: Effortlessly adjust speed, duration, and mode with a simple, external interface. Secure Mounting: Magnetic mount MFX-40 supports glass up to 5/8" thick and MFX-20 supports glass up to 1/2" thick for hassle-free placement. Energy-Smart DC Motor: Efficient, quiet performance ensures minimal energy consumption and reduced noise.