Water Quality Guide
Tech Talk 47
These are healthy, growing tolerances, not limits for fatalities. Use this chart for guidelines only. Tolerance levels can vary greatly depending on a variety of factors. Some species are also sensitive to nitrite above 40 ppm. Fish will excrete about 14 grams of ammonia for each pound of food eaten (@ 35% protein). Test kits read total ammonia; this guide gives un-ionized ammonia levels. See chart for conversion.
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