How often do you change your water?

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jgsolo32

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I have a 3 month old 20 gallon Cube and Monday is my water change and maintenance day. It's set.
 

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Sony Ph

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I have a 13.5 gallon tank that has been running for almost two years and a 40 gallon tank that has been running for just under a year. I got in the habit with my 13.5 gallon tank of changing the water every Thursday because of how the parameters could change so quickly. I also do this every week on my 40 gallon tank. I was curious to see how often everyone changes their tank water. Sometimes I think i can let my 40 gallon go a little longer but i get paranoid because I am on such a routine.
I change 5 gallons every Sunday on my 55 gallons tank.
 
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ncjeepguy75

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I change my water about once a month in my 100 gallon tank...here are the readings as of today which is at the month and 1 week mark since last water change...I have been dosing neo nitrogen to keep the nitrates up a little to hopefully help my goniopora recover from a low nutrient stretch while I was on vacation...
Screenshot_20210923-145133_Aquarium Note.jpg
 
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NashobaTek

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My 125 is going on 2 yrs old and I have never changed the water. I top off only. I tested my parameters and they're as follows.

Ammonia-0
Nitrite- 0
Nitrates-10
Specific gravity-1.025
Temp.-79°
Phosphate-4 still a little high
Ph-7.9 could be higher
Calcium-480

Only have one coral and it's a toadstool, doing great.
 
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