I've struggled with coralline algae in my 220 saltwater acrylic pool for a while, but work hard to place behind rocks and don't offer much cleaning power due to leverage issues. and a cross brace in the hole in the top of the tank to restrict movement. I've also had other brands of magnetic scrapers that don't work with thicker aquarium acrylic of this size (3/4 inch). Flipper saved me. I flicked the blade on the fin and tossed it into the tank. , and after running it along the front of the tank for a few minutes, over 90% of the coral was gone (material closer to the bottom took a little longer because I wanted to be careful not to catch and scratch sand on the unit). things, but it also came off easily, even with my smaller, more cautious movements). To be honest I don't care about the flipper and hardly ever flip it - I'm only giving it 5 stars because it works so well in an acrylic scraper. (From my little experience - the flipper function works unless you have too much current where you are trying to flip - the current can suck it out mid-flip. Only switch on heavy pumps or the flipper in areas with low current from ). Highly recommended.
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