Beside temperature shock, you should also look out for pH shock. If there is a huge difference in the pH of the 2 tanks, the fishes will also be severly stressed out. In extreme cases, it will die within hours.
Lastly, there is also osmotic shock, in which the mineral components are radically different and one is severely more saline than the other. This will also stress out the fishes.
All of the above can be countered by the drip method as suggested by medicineman.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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