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I’d say even way worse for a new coral or fish as this is a system now with different lights par temp and ext at least with a 100% water change you are using same salt,tank and extOn the other hand - if you use a salt that matches the alkalinity in your tank - even doing a 100 percent water change shouldn't 'matter'. (As you said - you would of course need to dose to keep your alkalinity at a certain level). If we think about it - we basically do a '100 percent water change' - each time we add a new coral or fish (from the perspective of the new animal) - i.e. they are being exposed to your tank which is different than the one from which they came?