Mark
When you cleaned the existing filter yesterday... could you have accidentally killed off the bacteria in that filter? I know that you are an experienced fish keeper but sometimes even the most experienced fish keeper will make newbie mistakes. Did you by any chance clean that filter in straight tap water? The reason I ask this is because I don't see how adding a new filter to an existing filter system woulsd cause your tank to go through a mini cycle. Also, check the date on your test strips... I've heard that these things can expire and give false readings.
When you cleaned the existing filter yesterday... could you have accidentally killed off the bacteria in that filter? I know that you are an experienced fish keeper but sometimes even the most experienced fish keeper will make newbie mistakes. Did you by any chance clean that filter in straight tap water? The reason I ask this is because I don't see how adding a new filter to an existing filter system woulsd cause your tank to go through a mini cycle. Also, check the date on your test strips... I've heard that these things can expire and give false readings.
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