I use an introduction tank inside my DT.
I couldn't keep a blue throat trigger at all. Quarantine them but as soon as they went into the display they died within a week. Stress of being around other fish and being picked on.
So I bought a reptile tank, cut slots into it, and put it inside the DT. Fed the new fish in the introduction tank and let the other fish get used to him. So far 100% success rate with 3 fishes including a Powder Brown that my Yellow Tang usually hates.
