21 of anything plus one more of the same thing add up to 22 of those things. In this exercise, the 'things' happen to be 'b's.
Time wise? If yes then the answer is no. 14:20 is more than 9:15
A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes.
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