Algae Grower

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High Nitrate  Dont know where it came from
Just tested nitrates in my new tank (ok ok its a bowl actually) and i was surprised to get a very high reading..about 50 mg/l maybe even more.
I have no idea how it became so high..my tap water tests between 0 & 10 mg/l
I dosed my stock solution yesterday but that should only add 5ppm of NO3
i used this calculator:
http://www.theaquatools.com/fertilizationcalculator
And put in the following numbers:
volume: 25 L
KNO3: 10.20 grams
I made a solution so i selected: Dissolved in a solution
Solution volume: 500ml solution
Amount addes from the solution: 10ml doses.
This gives me 5 ppm of NO3
Any idea what happened here, what could make the nitrates rise so high all of a sudden?
link to journal of the bowl for more info:
https://www.plantedtank.net/forums/sh...33#post8265633
Edit: Before somebody asks, yes the date on the test is still ok and yes i've tested twice
I have no idea how it became so high..my tap water tests between 0 & 10 mg/l
I dosed my stock solution yesterday but that should only add 5ppm of NO3
i used this calculator:
http://www.theaquatools.com/fertilizationcalculator
And put in the following numbers:
volume: 25 L
KNO3: 10.20 grams
I made a solution so i selected: Dissolved in a solution
Solution volume: 500ml solution
Amount addes from the solution: 10ml doses.
This gives me 5 ppm of NO3
Any idea what happened here, what could make the nitrates rise so high all of a sudden?
link to journal of the bowl for more info:
https://www.plantedtank.net/forums/sh...33#post8265633
Edit: Before somebody asks, yes the date on the test is still ok and yes i've tested twice
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Wannabe Guru
You're measuring about ten times the nitrate that you expected based on the calculation. That makes me wonder if the math is a bit off? By a factor of ten.
Could you post how much KNO3 you put in the 500 ml stock solution?
Could you post how much KNO3 you put in the 500 ml stock solution?
Daisy Mae V
According to my husband, I have a habit of jumping right in!
According to my husband, I have a habit of jumping right in!
Quote:
Originally Posted by Daisy Mae
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You're measuring about ten times the nitrate that you expected based on the calculation. That makes me wonder if the math is a bit off? By a factor of ten.
Could you post how much KNO3 you put in the 500 ml stock solution?
Could you post how much KNO3 you put in the 500 ml stock solution?
I added 10.20 grams to the solution. (The .20 is not unnecessary at all but its in there anyway so i wrote it down to be precise.)


Wannabe Guru
Have you calibrated your nitrate kit with a known solution? If not, the readings are probably off. Those kits are ALWAYS off. I gave up bothering to test at this point.
Quote:
Originally Posted by bsantucci
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Have you calibrated your nitrate kit with a known solution? If not, the readings are probably off. Those kits are ALWAYS off. I gave up bothering to test at this point.
One thing I forgot to mention. I did add a little pinch of fish food for the bacteria. But this can't possible be adding so much N in my experience.
Wannabe Guru
Your math is good.
The calculator link does not work.
Oh, my. I have not done these types of calculations in almost 3 decades, but to show your math is good:
KNO3 molecular weight (MW) is 101.1
K's MW is 39
Therefore NO3 MW is 61
The 10.2 gms of KNO3 translates to 6.15 gms of NO3 (10.2 multiplied by 61, then result divided by 101.1).
Hard to type math equations but here goes.
6.15 gm NO3/500 ml = 12.3 gm/L = 12.3 ppt NO3 in the stock solution
Which is also 12300 ppm NO3 in stock soln
Which is also 12300 mg/L NO3
[12300 mg/L x 0.010L (the 10 ml you added)] divided by [25 L (your tank volume)] ==> 4.9 mg/L
So, basically that's 5 ppm.
You can rule out the math, that's just about all I can help you with.
Did the KNO3 fully dissolve? I would expect it to.
Oh, my. I have not done these types of calculations in almost 3 decades, but to show your math is good:
KNO3 molecular weight (MW) is 101.1
K's MW is 39
Therefore NO3 MW is 61
The 10.2 gms of KNO3 translates to 6.15 gms of NO3 (10.2 multiplied by 61, then result divided by 101.1).
Hard to type math equations but here goes.
6.15 gm NO3/500 ml = 12.3 gm/L = 12.3 ppt NO3 in the stock solution
Which is also 12300 ppm NO3 in stock soln
Which is also 12300 mg/L NO3
[12300 mg/L x 0.010L (the 10 ml you added)] divided by [25 L (your tank volume)] ==> 4.9 mg/L
So, basically that's 5 ppm.
You can rule out the math, that's just about all I can help you with.
Did the KNO3 fully dissolve? I would expect it to.
Daisy Mae V
According to my husband, I have a habit of jumping right in!
According to my husband, I have a habit of jumping right in!
Quote:
Originally Posted by Daisy Mae
View Post
The calculator link does not work.
Oh, my. I have not done these types of calculations in almost 3 decades, but to show your math is good:
KNO3 molecular weight (MW) is 101.1
K's MW is 39
Therefore NO3 MW is 61
The 10.2 gms of KNO3 translates to 6.15 gms of NO3 (10.2 multiplied by 61, then result divided by 101.1).
Hard to type math equations but here goes.
6.15 gm NO3/500 ml = 12.3 gm/L = 12.3 ppt NO3 in the stock solution
Which is also 12300 ppm NO3 in stock soln
Which is also 12300 mg/L NO3
[12300 mg/L x 0.010L (the 10 ml you added)] divided by [25 L (your tank volume)] ==> 4.9 mg/L
So, basically that's 5 ppm.
You can rule out the math, that's just about all I can help you with.
Did the KNO3 fully dissolve? I would expect it to.
Oh, my. I have not done these types of calculations in almost 3 decades, but to show your math is good:
KNO3 molecular weight (MW) is 101.1
K's MW is 39
Therefore NO3 MW is 61
The 10.2 gms of KNO3 translates to 6.15 gms of NO3 (10.2 multiplied by 61, then result divided by 101.1).
Hard to type math equations but here goes.
6.15 gm NO3/500 ml = 12.3 gm/L = 12.3 ppt NO3 in the stock solution
Which is also 12300 ppm NO3 in stock soln
Which is also 12300 mg/L NO3
[12300 mg/L x 0.010L (the 10 ml you added)] divided by [25 L (your tank volume)] ==> 4.9 mg/L
So, basically that's 5 ppm.
You can rule out the math, that's just about all I can help you with.
Did the KNO3 fully dissolve? I would expect it to.
Yes the KNO3 did fully dissolve, I used lukewarm water so it was almost instant.
I'm going to make a new solution today, dose 10ml from that into a bucket with tap water and test again.
Thank you for the help with the math!
Planted Member
You said it's a new tank...could you have had an ammonia spike that has been converted to nitrates?
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Quote:
Originally Posted by Grumpy1415
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You said it's a new tank...could you have had an ammonia spike that has been converted to nitrates?
I'll do some research when I get home.
Would that go something like ammonia>nitrite>nitrate
Algae Grower
Yes that's how it works but sometimes it can be simultaneous. I'm doing a fishless cycle on a 29g right now (which means dosing ammonia directly until the tank tests 0ppm ammonia and 0ppm nitrite) and a few hours after dosing ammonia I'm getting a big spike of both nitrite AND nitrate; but no ammonia. Which means I'm nearing the end. When I no longer get the nitrites, the tank will be ready for fish.
Instead of adding fish food, you might considering going to a hardware store, perhaps even the grocery store, and buying a bottle of ammonia. Usually sold in the cleaning section. You want straight ammonia without other perfumes, etc. I buy "Janitorial Strength Ammonia" from Ace Hardware. It's just ammonia and water.
Instead of adding fish food, you might considering going to a hardware store, perhaps even the grocery store, and buying a bottle of ammonia. Usually sold in the cleaning section. You want straight ammonia without other perfumes, etc. I buy "Janitorial Strength Ammonia" from Ace Hardware. It's just ammonia and water.
Quote:
Originally Posted by Jonas
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I did not even know that was possible.
Would that go something like ammonia>nitrite>nitrate
Would that go something like ammonia>nitrite>nitrate
I just used to wait for 4 weeks before adding fauna.
Its beginner stuff aaaah maybe i should attend Aquarium school lesson 1.01
Planted Member
You knew it...it was just tucked away too deeply! Give it a few weeks and nitrate levels will drop.
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Quote:
Originally Posted by Grumpy1415
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You knew it...it was just tucked away too deeply! Give it a few weeks and nitrate levels will drop.
Its allready going down, the plants are doing their thing.
Planted Tank Guru
Quote:
Originally Posted by Jonas
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yes thats a good way to say it.
Its allready going down, the plants are doing their thing.
Its allready going down, the plants are doing their thing.
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