All chlorine removers remove chloramine. However, unless it is Amquel, Am-Lock or Prime the ammonia tide up in the chloramine will still be left behind. Tetra Aqua safe works this way, leaves the ammonia behind. To kill fish in minutes or a couple of hrs the ammonia would need to be through the roof. And as I stated before carbon will take both of them out to a point but not the ammonia but poly's due remove ammonia to a point. With a skimmer and a wet dry it can not be O2.
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Test your tank water with a different ammonia test kit