What makes an aquarium 'safe' to add 'difficult' inhabitants

What is the biggest factor that determines whether a tank is 'established' to add difficult species

  • Biodiversity

    Votes: 1 25.0%
  • Time >1 year

    Votes: 0 0.0%
  • Time. 6 months - 1 year

    Votes: 0 0.0%
  • Time is not important as long as proper bacterial populations are present

    Votes: 1 25.0%
  • Coralline algae presence

    Votes: 1 25.0%
  • Stable parameters (the big 3 - pH Alk Ca)

    Votes: 0 0.0%
  • Something else - mention in comments

    Votes: 1 25.0%
  • Survival of the inhabitants is the only important thing.

    Votes: 0 0.0%

  • Total voters
    4

MnFish1

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So - I keep hearing one needs to do x, y, z before adding (insert difficult to keep coral or fish here). I wanted to see what everyone thinks is the MOST important thing. I've heard every one of the choices below - so I'm interested in what everyone thinks. If you have another factor that you think is more important - add it in the comments:). Thanks.
 

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IMO abundant coralline growth is one of the best indicators tank is maturing and ready for harder to keep corals.
 
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