Sera Scrapers are strong cleaning tools for removing algae from aquarium glass. They are supplied with 4 attachments, 2x stainless steel and 1 plastic blade for removing algae along with a sponge for softer tasks such as removing biofilms and other dirt. These tools will help you clean your aquarium and remove stubborn algae with the minimum effort. Replacement single-sided stainless steel blades for Sera Glass Cleaner (CE020). These blades are also suitable for use the Ista Algae Scraper (CE076). Suitable for use in freshwater and marine aquariums. Available in 30cm long and 60-90cm extendable sizes.