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Do razor blades scratch tank walls?
In my 50 gal. planted tank, I occasionally have some extremely hard algae on
the glass, that can't be removed with a regular algae scrubber. I started
using a single-edged razor blade, and then noticed how crystal clear the
glass is afterwards. So, I have started using it on a weekly basis,
although the hard algae really doesn't collect that quickly; now I like the
clearer look. I am wondering whether this is a good idea - - does it
scratch the glass?
Also, is there some kind of "safe" holder for these razor blades? I am
feeling that it's a bit dangerous, especially in tight corners behind
plants, where I can't see what I'm doing. I do need to clean those corners,
because that side of the tank is visible from another side.