How Much Water Do You Change?

How much water do you change at once?

  • >25%

    Votes: 3 25.0%
  • 25-40%

    Votes: 5 41.7%
  • 40-50%

    Votes: 4 33.3%
  • <50%

    Votes: 0 0.0%

  • Total voters
    12
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Gatesy

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Hi everyone
A question out of curiousity
How much and how often do you all change your tanks water?

I currently change 40-50% twice a week on 2 of my tanks
75% of water for my betta tank twice a week and 40-60% (dependant on testing) of water every 10 days for my last tank
 

NavigatorBlack

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A lot depends on the tank. Size, inhabitants etc matter greatly.

A fry growout getting heavy feeding can get 50% twice a week.
An ordinary non breeding tank with reasonable stocking gets 30% every week to ten days.
My killie tanks get 30% every two weeks, as they don't like water changes (but need them).

Tank size, stocking, the natural history of the fish you keep, the ages of fish - all come in to play. What matters is the changes have to be regular, and tailored to the tanks based on research.
 

Redshark1

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For me "little and often" is best as far as water changes go as my parameters cannot then change as much.

If more water needs changing in a week then I increase the frequency of water changes not the percentage of individual changes.

Consistency is the key. This is how I have got my Clown Loaches to 24 years of age.

If my schedule allowed me to change 10% per day I would. Even better would be a drip feed and overflow.

River fish like Clown Loaches get fresh water constantly in their natural environments unless humans have polluted the waterways.
 
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Gatesy

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NavigatorBlack said:
A lot depends on the tank. Size, inhabitants etc matter greatly.

A fry growout getting heavy feeding can get 50% twice a week.
An ordinary non breeding tank with reasonable stocking gets 30% every week to ten days.
My killie tanks get 30% every two weeks, as they don't like water changes (but need them).

Tank size, stocking, the natural history of the fish you keep, the ages of fish - all come in to play. What matters is the changes have to be regular, and tailored to the tanks based on research.
Completely agree, depends what you stock and what your trying to achieve
 
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Gatesy

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Redshark1 said:
Little and often is best as parameters cannot then change as much.

If more water needs changing in a week then increase the frequency not the percentage.

Consistency is the key.
Little and often is not viable for me, 3 of my tanks are overstocked
I find in my largest tank I can't keep KH under control by changing smaller 25% changes throughout the week

As long as the parameters of the water going into the tank are close to the tank water I find my fish are more active and more vibrant with the schedule I have at the moment
 

Redshark1

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Then I withdraw my advice as I don't support overstocking aquaria.
 

GoldenWonderRyan

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im a student so have loads of time so i tend to do 20% everyday, i like doing it as it can get my corys to spawn about once a week which is super cool to watch, plus even though i am over filtered i like to always feed frozen food which i reckon pollutes the water a lot
 

Galathiel

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I believe the signs you used in the voting portion are reversed: the top one should be <25% to indicate less than 25% and the last one should be >50% to indicate greater than 50% change.

I do 30-50 percent on all my tanks, except my 46 gallon goldfish tank. I do 60-80 percent weekly on it.
 

varmint

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I do 30% water changes weekly, on all my tanks, except the shrimp tank I do every 2 weeks.
 
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Gatesy

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Redshark1 said:
Then I withdraw my advice as I don't support overstocking aquaria.
I don't support it either, I have full intentions of getting larger tanks when my house is finished
In fact I will be buying new, larger tanks and setting them up with my current equipment and stocking them with the the fish I currently have, using my remaining tanks as multiple quarantine/hospital tanks (different water parameters) and a propagating tank

I love my fish, but unfortunately I have overstocked due to misinformation from many chain pet stores and lfs
Is all I can do now is provide the best possible living and water conditions for my fish I currently have
 
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Gatesy

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Galathiel said:
I believe the signs you used in the voting portion are reversed: the top one should be <25% to indicate less than 25% and the last one should be >50% to indicate greater than 50% change.

I do 30-50 percent on all my tanks, except my 46 gallon goldfish tank. I do 60-80 percent weekly on it.
****, always get those mixed up, I'm not sure how to change it now :/
 

KinderScout

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25% of 120 litre for me. Only the PH generally varies. Tried every two weeks (due to illness) for a month. Parameters except nitrate ( which went up a bit) stayed the same. I'm a relative newbie but I log everything in the phone app Aquarium Note (there are other similar apps). This helps a lot as I can see a graph of each water parameter over time. I can also record changes such as addition of fish, plants and tank kit (just added CO2) - also record problems and correlate with everything else. It also had a scheduler so I get reminders if when to change various filters etc. This has really helped getting a balance between tank stability and work involved. Tanks are all different but it seems stability is key so record EVERYTHING to work out what's best for your tank.
 
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Gatesy

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KinderScout said:
25% of 120 litre for me. Only the PH generally varies. Tried every two weeks (due to illness) for a month. Parameters except nitrate ( which went up a bit) stayed the same. I'm a relative newbie but I log everything in the phone app Aquarium Note (there are other similar apps). This helps a lot as I can see a graph of each water parameter over time. I can also record changes such as addition of fish, plants and tank kit (just added CO2) - also record problems and correlate with everything else. It also had a scheduler so I get reminders if when to change various filters etc. This has really helped getting a balance between tank stability and work involved. Tanks are all different but it seems stability is key so record EVERYTHING to work out what's best for your tank.
Might have to download that!
I test my water twice a week and have a book full of my results and notes that I refer back to if I have any concerns...
Believe it or not I have been contemplating graphing my results but have not done it because of the time that I would have to spend doing it
This just may make my life a whole lot easier!
Thanks
 

KinderScout

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Gatesy said:
Might have to download that!
I test my water twice a week and have a book full of my results and notes that I refer back to if I have any concerns...
Believe it or not I have been contemplating graphing my results but have not done it because of the time that I would have to spend doing it
This just may make my life a whole lot easier!
Thanks
Screenshot_20180210-143005-640x360.png

an example of the output...
 

KinderScout

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Screenshot_20180210-143913-720x1280.png
 

Maypole Hugh

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I also do a water change every day on my 200 litre community tank, two buckets per day which equates to approximately 18 litres about (allowing for substate and decor) 10%. As has already been said these smaller daily changes are less stressful and I find this helps to keep down nitrates. My tap water has 20ppm nitrates and I find the daily water changes help keep the nitrates in my tank down to 20 to 30 ppm. I would like the nitrates to be even lower but with tap water being as high as it is then it is difficult to get down lower than 20ppm. I am fortunate as being retired I can find the 15 minutes per day to carry out this routine maintenance. My tank is well filtered having a fluval 206 rated for tanks up to 200 litres and also a Hydor external for tanks up to 150 litres. I also have seachem purigen in one my filters.
 

Tony M

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Have a 46 gallon bow front planted community tank over filtered with a Fluval FX4. I change about 75 to 80% once a week.
 

xloe

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KinderScout said:
25% of 120 litre for me. Only the PH generally varies. Tried every two weeks (due to illness) for a month. Parameters except nitrate ( which went up a bit) stayed the same. I'm a relative newbie but I log everything in the phone app Aquarium Note (there are other similar apps). This helps a lot as I can see a graph of each water parameter over time. I can also record changes such as addition of fish, plants and tank kit (just added CO2) - also record problems and correlate with everything else. It also had a scheduler so I get reminders if when to change various filters etc. This has really helped getting a balance between tank stability and work involved. Tanks are all different but it seems stability is key so record EVERYTHING to work out what's best for your tank.
I should have known there was an app for this stuff. Thanks!
I do kind of like my notebook, though
 

The Rover

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If you have live plants then they are also a consideration. I have a heavily planted 36 gallon bf and I’m attempting EI dosing so I do a 50% wc once a week.

Betta tank #1 also heavily planted 10 gallon gets 50% every 5 days.

Betta tank #2 very lightly planted 3.5 gallon gets 50% every 5 days as well.

QT is a 10 gallon gets 50% twice a week if I’m not having to dose any meds.

The fish matter obviously but so do your live plants if you have them and are following a growth strategy so they have to factor in as well IMO.

I also have very low kh of 2 so consistently doing wc’s helps keep my PH stable (I hope!)
 

bgclarke

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I typically do 30% weekly on most of my tanks.

Betta tanks have been getting 50% weekly lately.
 
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