Schroeder really explained it well.
A couple things to add. Salt water tanks tend to take longer to cycle then fw tanks. Even after the cycle is no longer visible, they take longer still to stabilize and reach equalibrium. Tanks aren't generally thought to be mature until around the six month point or perhaps even longer.
The best approach is to never put anything in your tank unless you are confident that it will survive, if not thrive. Certainally, don't put any fish in that you plan to take out later or that aren't on your "fish list".
Take your time.
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