35″ AquaBlade Aquarium Scraper – Continuum: Keep your tank squeaky clean with Continuum! Made of strong virgin white plastic, AquaBlades are much stronger and you will notice it once you feel them! The 35″ scrapers make a great cleaning accessory for almost any aquarium over 250 gallons or over 72″ long! Continuum Handheld Algae Scrapers are considered the gold standard of aquarium algae scrapers with two different blade materials: plastic and stainless steel.