Benfica540 said:25% + 25%= 50%
1/4 + 1/4 = 1/2
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DeLgAdO said:i think he means if you do a 50% water change then that means (according to the myth) you can do a water change every other week or alittle longer.

Benfica540 said:got ya. Just figured i'd be a smart ass about it though. You did ask us to do the math
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