This buffer is measured using a KH test kit. Simply stated, the buffer in your water is made up of dissolved compounds such as carbonates that resist changes in pH. In order to maintain a consistent pH, you need to have some buffering capacity in your water. A consistent (and stable) pH is much more important than an “ideal” one and the act of trying to create an “ideal” pH generally results in an unstable and inconsistent pH.įor significantly more detail on pH and it’s potential irrelevance, reference the following articles: The most important thing to provide your fish is a consistent pH. Typical oscars purchased from pet stores will thrive in any pH between roughly 6 and 8. If you are dealing with wild caught oscars or low generation (F1, F2, etc.) stock, the fish may not thrive unless it’s kept in acidic pH below 7. In their native environment, oscars live in the somewhat acidic water of the Amazon river system. This is simply not the case with the captive bred stock available in the pet trade today. One common misconception about oscars is that they require a specific pH. You need to periodically monitor these levels, know if the results are appropriate, and if not, take appropriate action to fix the problem. Oscars, and all aquarium fish in general are sensitive to ammonia, nitrites, long term exposure to high levels of nitrates, and large swings in pH and KH levels.
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