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Freshwater Fish and Resources

Home     High Prairie Farms    Fishing Stories    The Bug Farm
Atchison Staffing   
Betty and Beth Buttons    The Universe BLOG

2001, 2002, 2003, 2007, 2008, J. Atchison
AboutThoseWaterChanges.gif (1035 bytes)

So...your nitrates are high and seem to be going up? How can this be so...you do 10 percent water changes every week like some sort of religious ritual. Well take a look at this chart and perhaps you can figure it out.

Remember that the nitrates in the tank are the result of a measurable ammonia output by the inhabitants. Once the tank has become established, the nitrate production starts somewhat constant (remembering that fish grow, bla bla). So changing a certain amount of the water each week will have a measurable and somewhat constant effect on the nitrate levels...but...if your water change is too small or the frequency wrong, the nitrate level will continue to climb.

Reading the following chart can be a little tricky. The first row is the size of the water change. The second row is the frequency of that water change. The first column on the left is the relative nitrate reading each day (changing to months). In the row that is labeled "Day 1" is the daily rate of nitrate production. If you were to have a reading taken every day just prior to a 100% water change, this would be the nitrate production per day. The daily production is somewhat relative because all the factors of nitrate production can not be accounted for in a straight-line calculation. However, the point being illustrated is still graphically demonstrated by the chart.

If you look at the last row you can note that changing 25% of the water daily produces roughly the same result as changing 50% on a weekly basis. One task being infinitely less demanding than the other.

Understanding that other issues play a role such as consistent water condition being important as opposed to periodic corrections and that some make their water changes based upon personal life style, the chart is meant as a guide. The only truly accurate schedule would be designed based upon proper testing for nitrate levels and adjusting those levels through water changes at appropriate intervals.

 

amount of change>

50%

25%

10%

frequency of change>

monthly

weekly

daily

monthly

weekly

daily

monthly

weekly

daily

measures taken at:

measured nitirate>

Day 1

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

Day 2

. .

0.75

. .

1.125

. .

1.35

Day 3

.. .

0.875

. .

1.593

. .

2.115

Day 4

. .

0.937

. .

1.945

. .

2.803

Day 5

. .

0.968

. .

2.208

. .

3.423

Day 6

. .

0.984

. .

2.406

. .

3.980

Day 7

.

1.75

0.992

.

2.625

2.555

.

3.15

4.482

Day 8

. .

0.996

. .

2.666

. .

4.934

Day 9

. .

0.998

. .

2.749

.

5.706

5.341

Day 10

. .

0.999

. .

2.812

. . .

Day 11

. .

0.999

. .

2.859

. .

6.036

Day 12

. .

0.999

. .

2.894

. .

6.332

Day 13

. .

0.999

. .

2.920

. .

6.599

Day 14

.

2.625

0.999

.

2.625

2.940

.

5.985

6.839

Day 15

. .

0.999

. .

2.955

. .

7.055

Day 16

. .

0.999

. .

2.966

. .

7.249

Day 17

. .

0.999

. .

2.974

. .

7.424

Day 18

. .

0.999

. .

2.981

. .

7.582

Day 19

. .

0.999

. .

2.985

. .

7.724

Day 20

0.999

2.989

7.851

Day 21

.

3.062

1

.

2.625

2.992

.

8.536

7.966

Day 22

. .

1

. .

2.994

. .

8.069

Day 23

. .

1

. .

2.995

. .

8.162

Day 24

. .

1

. .

2.996

. .

8.246

Day 25

. .

1

. .

2.997

. .

8.321

Day 26

. .

1

. .

2.998

. .

8.389

Day 27

. .

1

. .

2.998

. .

8.450

Month 1

7

3.281

1

10.5

2.625

2.998

12.6

10.832

8.505

Month 2

13.890

3.486

1

36.393

10.492

2.999

65.734

17.940

8.974

Month 3

13.945

3.499

1

37.795

10.497

3

71.761

22.603

8.998

Month 4

13.972

3.499

1

38.846

10.499

3

77.185

25.662

8.999

Month 5

13.986

3.499

1

39.634

10.499

3

82.066

27.670

8.999

Month 6

13.993

3.5

1

40.226

10.499

3

86.459

28.987

9

Home     High Prairie Farms    Fishing Stories    The Bug Farm
Atchison Staffing   
Betty and Beth Buttons    The Universe BLOG
2001, 2002, 2003, 2007, 2008
, J. Atchison