06-04-2007, 01:51 PM
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Originally Posted by fish_4_all
160 ppm is kinda high though leifthebunny, I have heard that any moderate exposure to levels over 80 ppm can be harmful or even fatal to fish. OF course this depends on what kinda terst you are suing as to what levels you could see no effects from to the fish. When I used the test strips it seemed like it always read above 80ppm with no problems. But with my liquid regent test kit I have seen problems at 60-80ppm.
I've seen a couple of different things on this. Of the more credible sources, some fish can tolerate up to 800ppm, others (fry, babies, ...) as low as 200ppm before it starts becoming fatal. Fish prefer to be under 40ppm though. In the case of the 160ppm, I have seen angelfish in a tank with 160ppm with no adverse affects and the tank was fairly well planted.