Water is not "cycled" - bacteria colonies within a tank are what keep it cycled. Moving the water over and no filter media or live rock would not help to cycle the tank.
Most likely you are experiencing a new cycle in the tank. Fish are susceptible to ammonia and to a less extent in sw
, nitrite. Most likely, you will need to perform some water changes to get your water to safe levels for your fish.
It is also important to temperature match the water, and if it wasn't matched, this could stress the fish.