If the new tank does not have an established

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: bio filter the ammonia and nitrite would be toxic...the tank would be overstocked for what it could handle. : But, we don't KNOW the details of the tank, as the poster did not give us any more to go one...therefore, we must imagine that is the worst case scenario and give advice that addresses things like toxic water. : Are you following me??? If they were physically overcrowded in the smaller tank, but had an established bio filter, they would not have suffered the effects of ammonia and nitrite. : Upon being given more physical space (it may not be enough space...we don't know how many koi etc) the nitrogen cycle may need to be established all over again, causing great distress to the koi. : Frequent water changes(daily if needed)& the addition of salt would be used to treat this situation. : So, you see, we really DO need more info about the tank and it's occupants in order to effectively offer help. : : : Overcrowding wont make the fish hanging on the center of the tank. How did overcrowding happens since its from a 4ft. transfered to a bigger tank and its became overcrowding its impossible. Even its overcrowded the fish wont hang. : : : : how many gallons are in this 4ft tank or 8ft tank? and how many koi are in there, how big are they? Have you done any water test? (ammonia, nitrIte and nitrAte) I'm guessing that you have too much fish in Too small an area and that water quality is to blame. : : : I hope this future pond isn't too far into the future. : : : Start doing Lots of water changes on this tank to give you fish a chance. : : : How much and how often are you feeding them? whats the temperature of the water?

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