Magnetic glass cleaner - which one?

Hate to hijack the thread but I have the Nano Tunze scraper and it seems pretty weak. Should I have bought the bigger one for my 28 gallon?
 
For people with the flipper, is it safe to keep the metal blade in water all the time? how often are you changing the blade?
 
I've kept mine in for a while now with no sign of issue on blade or in tank. I was removing after each use when I first started, but, then thought about constantly exposing to air and water and going back and forth. Thought it would be better to keep fully submerged. Just my thoughts and opinion. It's been 3-4 months and still the same blade with no risk of scratch. Then again, it was a new tank, so not really getting into corraline too much.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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