you have moved your fish from and uncycled tank to another uncyled tank. have a good read of the beginners section on cycles.
ANY ammonia is toxic to fish...ANY NitrITE is toxic to fish, the only way you can instantly cycle a tank is with very mature media being placed inside a new filter.
you do not need carbon in the filter at all unless you wish to erase medications from the water. After 2+ weeks this will become inactive and just become another form of media sponge for your filter...by throwing it away you threw away a good majority of your good bacteria, causing an ammonia spike, which poisoned the fish.
DAILY waterchanges are now needed to help those good bacteria breed again IMO they would be safer in the first tank with daily w/c's than in a completely new uncycled tank.
ANY ammonia is toxic to fish...ANY NitrITE is toxic to fish, the only way you can instantly cycle a tank is with very mature media being placed inside a new filter.
you do not need carbon in the filter at all unless you wish to erase medications from the water. After 2+ weeks this will become inactive and just become another form of media sponge for your filter...by throwing it away you threw away a good majority of your good bacteria, causing an ammonia spike, which poisoned the fish.
DAILY waterchanges are now needed to help those good bacteria breed again IMO they would be safer in the first tank with daily w/c's than in a completely new uncycled tank.
