Any bright ideas out there that are effective for this purpose without risking scratches to the black plastic?
While I recognize that elbow grease is part of the answer, it isn’t the only answer. You can be the most disciplined at maintenance but sooner or later you will go on vacation or be away from the tank for a week or more. Coralline algae will know this and jump at the opportunity. When you get back, it will no longer be easy to remove with a plastic scraper.
Thanks in advance.
Art