Assertion: ammonia | /r/HasProperty | left by the bacteria
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Source sentences:
text: If pH rises to near 8 or above, even tiny amounts of ammonia that may be left by the bacteria will be toxic to the fish, but if pH falls below 7 the bacteria will quit and ammonia will soar to levels dangerous even at the relatively safe low pH. As explained in the previous chapter, carbonate buffering provided by sodium bicarbonate makes it relatively easy to maintain pH in the ideal range of between 7 and 8.