I only use plastic blades for glass now with the occasional metal for stubborn areas. I have had metal blades from many brands scratch glass over the years even removing the mag after use and bare bottom tanks. Some may use metal blades for years and not have issues, awesome for them, but I scratched custom miracles tanks, WB, marineland, IM…. You get the idea. Scratched with tunze, flippers, and another expensive brand I can’t remember. All the tanks were low iron glass, never had regular scratch but I have not had one of those in a long time
I tried to sand one of the miracles tanks out maybe 10 years ago. It really didn’t work well and was a ton of work. Ime just accept the scratches unless they are very light and use a plastic blade for general cleaning removing it after use.
I like the tunze plastic blades over the flippers plastic. Ime metal is just too risky since a scratch can happen for seemingly no reason you can think of and once done it’s done.
I know it’s a bummer but it happens to many people so you’re not alone.
I tried to sand one of the miracles tanks out maybe 10 years ago. It really didn’t work well and was a ton of work. Ime just accept the scratches unless they are very light and use a plastic blade for general cleaning removing it after use.
I like the tunze plastic blades over the flippers plastic. Ime metal is just too risky since a scratch can happen for seemingly no reason you can think of and once done it’s done.
I know it’s a bummer but it happens to many people so you’re not alone.