
This statement is true of any magnetic algae scraper strong enough to clean material 1in or thicker. Always scared the crap out of me when I was getting ready to use or putting away my heavy magnets.Thanks for the suggestions. My tank is 3m deep & fairly long. I'm getting too old to dive each time I want clean glass.
Rick from Mighty Magnet is quick to respond. The larger magnets if allowed to touch can't be separated again.... ever. Sayonara to $1K. 00 So definitely would break bones and crush fingers.
I'll go for the version strong enough for 4 inch glass. In case I get a bigger tank one day.