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.
 

WHAT’S THE HARDEST PART OF REEFING TO EXPLAIN TO A NON-REEFER?

  • Why a tiny coral frag can cost that much

    Votes: 4 23.5%
  • Why I spend time testing and adjusting water

    Votes: 5 29.4%
  • Why the fish I want might not fit my tank

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  • Why I have buckets, tubing, and salt around the house

    Votes: 1 5.9%
  • Why corals are living animals, not decorations

    Votes: 5 29.4%
  • How much time and attention a reef takes

    Votes: 7 41.2%
  • The difference between freshwater and saltwater creatures

    Votes: 1 5.9%
  • I’ve stopped trying to explain

    Votes: 7 41.2%
  • Other (Post in the comments)

    Votes: 0 0.0%
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