Hello; I have read about this a few times over the years. Some forum members such as Duanes have professional experience and very good knowledge of chloramine. I hesitate to add much but will with the understanding this needs to be verified. I seem to recall something like this. The tap water chloramine that shows up on the test as ammonia can be bound up by a product such as SAFE or PRIME for a time. During that time the active beneficial bacteria (bb) can and do use this ammonia same as any other ammonia. I guess what this means is there is no reason to panic unless somehow the established bb have been killed off or reduced in sufficient numbers.
The ammonia reading may not have been a cause of the fish death.
Hello; This is also worth considering. I know many like and have success with large % WC. But if as I understand it only small WC have been the normal procedure then doing a sudden big WC can give a pH swing. Nothing wrong with big % WC if that has been the norm. Just build up to a big % over a few days.
