I'm at the end of this treatment. I went three weeks, scraped, and on Monday I'll scape again after four more weeks. It's very sparce after the initial scrape, but still there so I'll do it again.
My biggest problem I think is I have to take the light off the tank, and I can't see well enough to get every bit of it. It never has been really bad, but I just don't want it in my tank, at least on the front glass.
I'll let you know my final results, good luck with yours.
Wouldn't you like to beside the seaside?