I don't think a qt tank was meant to help reduce stress. A qt tank is exactly that. A quarantine tank. You quarantine your fish/corals so you can monitor their behavior, as well as any signs of pest or illness the fish/coral may have. At which time it would make it easy to treat for such without the worry of harming other tank mates. Doing so will eliminate the question " so my fish/coral has this, I want to treat them with that, will it kill my other instock? You get the idea.
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