I agree. Soak the area with white vinegar, then wipe it away with a cloth/paper towel/sponge/etc. Anything that's soft and wont cause scratches.
After soaking it, it will wipe right off. It's the same trick as cleaning other equipment that's covered in coraline. Stuff just comes right off after soaking it in vinegar (I usually do half water half vinegar).
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Originally Posted by Ruth
I have 3 acrylic tanks (2 X 20g and 1 X 190g) and IME they scratch very very easily so be very careful. I would not use the magnet cleaner if I was you. It is too easy for a little piece of "something" to get stuck under the magnet and scratch your tank. I have used just the acrylic scrapers to get coralline off with no scratches but you do have to be careful. Soaking the tank with vinegar before it is filled with water should allow you to just about wipe the encrusted coralline off with a soft cloth - or use an acrylic scraper lightly.
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