Can be used on glass or acrylic tanks up to 0.39" - 0.79" (16 - 20mm) thick Strong magnetic forces cause the inner cleaning brush to match the outer handle follows. Just wipe the outside and the inside is clean! The inner part floats, so it’s easy to get back if it detaches from the outer part. It’s easy to clean algae and remove foam from inside your aquarium. Remove algae with the blade.
