I can’t speak for others, but I’ll chime in with an update as the OP. Eventually, all the algae came back. So in the end, I just caused harm. Razor went in the trash along with anything else. It’s been so long since I’ve done this, I’ve done other things to control the algae. 1) I completely redid my rockwork. The main reason for this was so I could more easily remove the rocks, and scrub the algae off. 2) I’ve stopped adding chemicals to my tank. I think the only thing I’d use ever again would be reef flux - but even then, it’d have to be a desperate bryopsis infestation. 3) I added significantly more CUC to my tank. Shout out to my urchin workhorse.