Well I started on the scraping today and discovered that my Therme Algae Terminator is not heating up.
Last time I used it was about 4 months ago and it worked just fine. I called the number on their web site but got the guy's wife on a cell phone breaking up, so hopefully he will get back to me and figure this out.
Not cool because the coraline is so thick, it won't come off with standard scrapers or even a DIY acrylic scraper. I really need some elves.