Safe for Both Glass and Acrylic Tanks! When it comes to aquarium scrapers.......One size does NOT fit all! Flipper Platinum NANO Aquarium Scraper for NANO-SIZED Glass and Acrylic Tanks. Features: * Nano Platinum scraper is specially designed for use in nano aquariums. * Scrubber + Scraper 2-in-1 design allows for fast efficient tank maintenance. * Made with a shallow scraper angle, ideal for the tight confines of nano tanks * Comes with a square credit card style blade, safe for glass or acrylic. * The blade can be inserted in any direction to access multiple different scraper edges. Or....just insert an old credit card, gift card, hotel room key etc to make your own specialized blades! * You may never have to buy blades again!! * Optional stainless steel blade (sold separately) is great for tackling really hard algae deposits all over your tank (for glass tanks only). * Replacement acrylic blades are available as well. Check out a review from BRStv: