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I use a single-edged razor blade. I have a GLASS tank.
Acrylic requires a special cleaning pad and is a whole other problem.
Somebody has made a device that locally heats the coralline from the outside of the tank to enable removal.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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