Mysteriously no measurable Nitrates or Nitrites

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I have a 20 Gallon Red Reef Max Nano. It’s been up since April 26th, 2 months. Post cycling, my Nitrites were as high as 0.15 ppm, but within about 7 - 10 days dropped to 0, and they have been undetectable since via Salifert test kits. N02 and N03 have both been undetectable. I had some diatoms at first and then about three weeks of Cyno, which disappeared. I also had massive amount of a red/brown ‘algae’ of some sort that was all over the rock (anchored to the rock) and completely covered the back wall of the tanks. Like, a huge amount. I figured I had N02/3 and the algae was consuming it out of the water column, resulting in 0 values showing up on the test. I was over feeding, so this theory seemed reasonable.

I reduced feeding, and within a couple of weeks, all algae disappeared. It’s completely gone, but, my tests still read 0. N02/3 have been 0 since May 11th.

I have:
2 Helfrichi firefish
1 Tailspot Blenny
2 Trochis snails
2 Nassarius snails
4 tiny Cerith snales
14 corals

Most everything seems healthy: Gorgonian has full polyp extension, I have 3 Acropora already showing good growth, 2 montiporas doing well, Mushrooms are growing/splitting, a Leptoseris that is beginning to encrust. I have 6 hammer/frogspawn euphyllia that are doing okay… some better than others. I ca see copepods at night.


I feed pellets twice a day, I toss in some Reef Frenzy about 3 times a week
I have NO skimmer, use 1 unit of the smallest size Chemipure classic, floss, and matrix (I have about 10-15 lbs rock)
I am not stingy with my feeding
I do a 25% water change about 1/month

Salt: 34.9 ppm
Phosphate: 0.06 ppm
Alk: 7.2
N02: 0
N03: 0
Mag: used Hanna Mag checker, so who the hell knows?
Ph: 8.0
Temp; 78.2

Where are my Nitrates?
 
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A. sounds like you have an API tester if you are getting zero. Notoriously inaccurate and unreliable. Nitrites SHOULD go away...nitrates are the ones you should expect. Side note for you...zeros are BAD for nitrates. It invites dinos.
 
Your using salifert which I do as well but recently bought a Hanna as I like to have more than 1 test in case of weird readings. Maybe test with a different kit to compare accuracy? From my limited experience I wouldn't be surprised by 0 nitrites since the cycle is complete but I would expect to see some nitrates.
 
Yeah, I agree that I care about nitrates. I know that zeros are bad, which is why I’m looking for help.
A. sounds like you have an API tester if you are getting zero. Notoriously inaccurate and unreliable. Nitrites SHOULD go away...nitrates are the ones you should expect. Side note for you...zeros are BAD for nitrates. It invites dinos.
I’m using Salifert, not API. These tests are the same ones that measured a reading before, so it would be weird for them to suddenly stop working. I also use Aquavital test strips, which also give me a zero reading
 
Your using salifert which I do as well but recently bought a Hanna as I like to have more than 1 test in case of weird readings. Maybe test with a different kit to compare accuracy? From my limited experience I wouldn't be surprised by 0 nitrites since the cycle is complete but I would expect to see some nitrates.
Totally agree. Aquavital test strips also show 0
 
Yeah, I agree that I care about nitrates. I know that zeros are bad, which is why I’m looking for help.

I’m using Salifert, not API. These tests are the same ones that measured a reading before, so it would be weird for them to suddenly stop working. I also use Aquavital test strips, which also give me a zero reading
well...if you are at Zero nitrates..go get some sodium nitrate and dose a little. Pretty cheap on amazon. A LITTLE goes a long way.
 
well...if you are at Zero nitrates..go get some sodium nitrate and dose a little. Pretty cheap on amazon. A LITTLE goes a long way.
I may do that, thanks. But, I feel like I want to solve the mystery of why I would have to dose
 

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