IS apple cider vinegar reef safe?

have you watched brs's 52 weeks of reefing on you tube by any chance? Feels like you are still getting started. There new stuff leans a little toward advertising to much for me but there older stuff is awesome. More research the better in many cases.
 
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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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