D-D Blade Runner Magnetic algae scraper - An ultra-slim cleaning magnet using strong rare earth magnets.
Designed to run on 2 blades for minimal contact with the glass or acrylic surface, which will reduce the potential for accidental scratching. The neutral buoyancy sinks slowly aiding simple recapture of the magnet and will not plummet to the bottom of the tank if it is knocked off, causing potential damage to delicate corals.