I have the flipper and I also bought a tunze scraper. The flipper is annoying.
Like Mindy said it doesn't float so heaven forbid you should drop it whilst trying to flip it. It also scratched my glass in quite a few spots. I didn't find it as easy to flip as the videos made out either.
The tunze one seems to work well and doesn't make me too nervous when I'm scraping right down to, and into the sand. Plus it rolls the algae into a nice sausage shape and detaches from the blade for awaiting herbivores.
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