Good Algae Scrubber/Scrapper for Acrylic Tank in Equipment Posted September 29, 2016 http://cloud.tapatalk.com/s/57ec2e17d86aa/IMG-20160928-WA0019.jpeg? Is this the right one? Sent from my SM-N915V using Tapatalk Yep those are them, disregard the not for aquarium use... I have no clue why they have that on there. I rinse mine before and after every use. I've been using them for 10+ years on my tank with no ill effects. Best way to use them is by hand in the tank, You'll be amazed how quickly and easily you can cut through anything with them by hand. The outer layer is what does all of the scrubbing, inside they're just a piece of sponge.