Water Change Question

[brendac]

I want to do a 10% water change every week in my 125g. how many gallons at 10% would that be a week? Sorry not the greatest at math.

 

[skywatcher]

12.5 gallons

 

[hatessushi]

Just round it off to 15 or 20 to be safe. I have a 90 and I do a 10 gallon change instead of 9 since the buckets are 5 gallons each.

 

[reckler]

no math really required. Take a sharpie and make a small mark somewere on the glass that only you can see 1/2 way down the glass, then between the top of the tank to your first mark make another mark, repeat again and you will basically have your settings for water changes. 50%,25%,12.5% that should work for you. I am good in math but I did it to my tank and it keeps me from having to think about it everytime I do a water change..