women?! pleeze. you're like one of my grandsons. I can't even visualize you thattaway, it's just wrong.
I forgot all about NLS.
you might wanna cut back on your jet fuel intake.
Assuming water params are safe, 50% is better becuase it's less time consuming. It's also less stressful for the fish. If you're in there anyway, change the 50% at once and the tank will look good all of 6 days of the week instead of 5.
keep in mind that chloramine is the hidden killer. imo you should still treat your water.
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Do you people have filters on your tanks? Why are your changing your watter so frequently? I normally change the water in my tanks every 2 weeks. some times it ends up being almost once a month. I run under gravel filters and canister filters. I have well water so I never treat my water. I fill with 100% cold water because I run the water through a filter so it takes a long time to fill my 150g and 220g tanks back up. I have a float switch that automatically turns the water off when the tank gets full.