Water Changes - How many and how often?

Hey everyone

Just curious to see how often people do water changes, and how much they take out. I see that most LPS's recommend once a month with 25% taken out, while a lot of books that I've read say that 25% should be taken out every two weeks.

I suppose it all depends on what you're stocking and how much time you have, so if you want to, post reasons why you do or do not do regular/large water changes.

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Here's what everything on the poll means:

Decent = between 5% and 25% water change
Large = 25% to 50% water change
Massive = more than 50% water change

Frequent = water changed once a week or more than once a week
Regular = roughly every 2 weeks
Monthly = about once a month

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Cheers
SA

 

i change 10 litres once a week on my 60 litre cory tank.

 

I do a 30% to 40% water change in all my tanks Weekly

 

30-50% weekly.

 

Well i do a 25% every fortnight.
That is massive.(200 Liters)

 

i do a 25% change every 2 weeks like clockwork,i have a 200l tank..

 

30 to 50% every 10 to 14 days on the 2.5m

 

I do 50% on all my freshwater tanks, every two weeks, so round about 675 litres every fortnight...

And dude, Henk, I really feel sorry for you bud I hate big tanks when it comes to cleaning corners!

 

naw its easy! we suck up all the crap and then we walk away with a pipe set to the level that we want.... keep on flooding the house on the refill

 

LOL, a cup and a half each week. :bigsmile:

10L tank FTW! :bigsmile:

 

I have a 100 litre Tank,i change 30 Litre each week.(still have to post pics for new tank though)

 

On my 100l i do a 40% water change once a week.
75l also 40%, was only been running for a week i think and already have done a water change.


I do a 100% water change plus cleaning of hole tank about once every month and a half or 2.

 

If I have to do a 50% water-change, I will flood my garden.
Either I have too much tanks, or the garden is very small... the garden-service don't think so.
Gert.

 

lol,how often do you cycle your tank?

 

After every 100% water change???

Am i doing something wrong

 

A full cycle will only be after about 21 days...

 

LOL,you should never take out 100% of the water or else you have to cycle the whole tank agaun,guess you will have to wait 28 days before you can add your fish again.

 

i do a 1/3 water change on my tanks every 2 weeks.

 

Yeah, the largest water change you would ever need to do is 75%, and I mean that is the maximum, when things are really going wrong in the tank.

Normally it's best to do anything between 25% and 50% change IMO.

Doing a 100% change is dangerous for the fish, as this can likely kill off the beneficial bacterial colonies and put quite a bit of stress on the fish as well.