Water change schedule

[Partha007]

Between Water change schedule- 10% every 10 days versus 30% monthly, which one better for a fish-only tank?

 

[Lasse]

As you can see 10% every 7 days will give a little bit better water in average than 30% every 30 days. I have also put in a daily WC of 1.4 % and 3 % as comparision.

Sincerely Lasse

 

[Partha007]

As you can see 10% every 7 days will give a little bit better water in average than 30% every 30 days. I have also put in a daily WC of 1.4 % and 3 % as comparision.

Sincerely Lasse

How will the graph l

As you can see 10% every 7 days will give a little bit better water in average than 30% every 30 days. I have also put in a daily WC of 1.4 % and 3 % as comparision.

Sincerely Lasse

How will the graph look like for 10% every ten days?
What schedule of water change(amount and interval) may be a balance for reduction of pollutants, efforts on the part of aquarists and no sudden big changes in water chemistry?

 

[Lasse]

In a only fish tank - the chemistry is not very critical but I think that a daily WC between 1 and 3 % would be the perfect balance of all three things you mentioned. It can be set up automatically. Answer to your question

How will the graph look like for 10% every ten days?

With this graph

Sincerely Lasse

 

[dmiller212]

Super interesting graphs and info!

 

[Raamish14]

As you can see 10% every 7 days will give a little bit better water in average than 30% every 30 days. I have also put in a daily WC of 1.4 % and 3 % as comparision.

Sincerely Lasse

I’m thinking to do one every 30 days for my two clowns in a fowlr tank and then an extra one every now and then to reset everything back down. But then again 2 clowns won’t even make 1ppm a day for me. I give them 8-10 pellets total a day.

 

[Lasse]

the 1 ppm was only an example and it was chosen because it is easy to extrapolate—for various inputs —how many ppm of different substances are added to the water column via feeding. The "status quo" level (where the amount removed by a water change equals the amount added through feeding) is determined by the level of the input. The smoothness of the curve, as well as the point in time when this status quo is reached, are determined by the frequency and the percentage of the water change.

Note that these curves apply to a "fish-only" aquarium with little or no growth of photosynthetic organisms. If there is a significant population of photosynthetic organisms, the curves will show a lower "peak" and reach the status quo sooner—read regarding inorganic nutrients (primarily PO4 and the NH3/NH4/NO2/NO3 complex)—because there is an additional factor, beyond water changes, that removes these substances from the water column.

Sincerely Lasse