Coraline algae covers my acrylic tank walls and is a pain in the neck to scrape off by hand. I also have a very aggressive mated pair of clown fish that just beat my arms and hands up when they are in the tank. with this I can scrape the tank and stay dry/not bleed, and not get worn out from the reaching and bending required to reach in the tank. this is made to use the original large ~2"x3" magfloat. a 1.125" wide piece of acrylic (however long you want it to be) is attached using a 1/2" stainless screw.