Thanks to its 11 flexible cleaning cards, the Alg-devil cleans exactly the same spot 11 times in just one stroke. Even stubborn algae will look a breeze. The flexible cards exclude the scratching of the aquarium's acrylic or silicone. It is made of neutral plastic material and can even be used in saltwater aquariums without a problem.
Caution: be careful not to catch pebbles between the fins. Otherwise, these small stones can scratch the glass.
