The Flipper Cleaner algae scraper looks very promising and should easily flip into a lot of our aquariums at the end of the month when it goes for sale. First of all it works on glass up to 1/2" thick, comes with a stainless steel blade that slays coraline as shown in the video and also a serrated plastic blade for acrylic tanks. One side is a soft cleaning pad for daily maintenance and a flip of the handle gives you the blade side. It always sinks upright so you can retrieve it easily. Very nice at an intro price of $19.99. The Flipper is available January 30th. Flipper Web site: Flipper Cleaner | Flipper Cleaner. The best aquarium cleaner on the market.