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Old 03-28-2006, 12:17 PM   #1
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How to calculate PWC percentage

I know this is a silly question but when you're aiming to do a 10-20% PWC, how do you calculate how much that is? Do you add the capacity of your sump and main tank together and then figure the % from there....or is it better to just go with the % from the main tank?

I'd imagine it'd be better to go with a bigger water change but i don't knwo if it's really necessary. So if i have a 75g tank and an 18g sump...i should be doing between 9-18g PWC's. What do you guys recommend, lets say for a bi weekly water change...the 9 or 18?
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Old 03-28-2006, 12:52 PM   #2
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I think you'll be fine with 9-10g bi-weekly water changes.
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Old 03-28-2006, 01:04 PM   #3
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