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Not much. The only problem with long acclimations is ph change. Safest to use both a refractometer and a ph meter in acclimation and pay more attention to those than to the clock...and of course never allow his bag water to touch the water in your tank.
But he'll probably be fine. If there was a difference in iodine content in your water and his, that also could feel funny to him. Crabs, shrimp etc are sensitive to that. Don't try to dose it, in a 30.
You might want to do your weekly water change soon to be sure trace elements are up to snuff in your tank. Inverts rely on those more than fish do.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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