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just saw this thread... I have noticed loads of very fine internal glass scratches from my flipper. I'm super careful to check for sand if I use the pad side so I think it's the blade side. Very frustrating! Any way to get these small scratches out without draining the tank etc? I'm envisioning some sort of magnetic buffer on the inside spun by a powerdrill w a magnetic bit on the outside... anyone? Does buffing out scratches weaken the glass?
Yeah, it definately leaves scratches. You might not even notice them until algae grows within the scratch. I am not sure if they are happening with it is being flipped or when the blade size is being used but I would stop using immediately. I kept my glass scratch free for years until I started using it.....and I used multiple other magnets over the years. Back to the magic eraser!
These are my exact experiences. Bare-bottom tank. It was definitely blade side, I never used pad side.