Upgraded Tank Size - Fish are Dying!

[Freshsaltwatertank]

How can i treat a streessed clownfish of ammonia is 0 and the tank is 3 months old

 

[Freshsaltwatertank]

Help fish are strees after adding allot of water to aquarium after changing to a 30 gallón from a 15 Gallon i added the 15 g cycled water to the 30 g and them added the rest of the water to fill up the 30 gallón Now one fish die and the rest are strees. WHAT COULD I DO

 

[fort384]

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.