Nitrates after power outage?

Devisissy

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Resently lost power due to a wind storm. 4 days, 3 nights. I had a generator running two heaters and one pump. My tank is a 45 gallon nano. It's a deep sand bed and the tank is still new. I have been having on going issues with nitrates being much to high. Before the power outage I was winning. I had them from 40+ down to 20. I achieved this by adding more flow in the way of larger pumps so that more water would be moved over the filter media, and I added Seachem Matrix in one of the baffles. I also did a thorough cleaning of the back chamber, (it's an AIO) and added an extra WC each week. Last but not least, I got a pack of reef worms. Before the power outage I was at 20. Then we lost power.

It's cold here so tank dropped from 80 to 73, even with gennie running heater. I didn't have enough power to run the main pump so I could only run a smaller powerhead for water movement. So no water is moving over media. It was like this for three and a half days. When power finally came on I did an emergency WC. Planning on doing another one in two days, I decided to test the water. So exactly 48 hours later I test tank. All parms were spot on except PH was a tad low, for me, and alk a bit high, but my nitrates were less than 5. I used red sea kit, and my old API. Both were the same. I ran test twice to make sure. I didn't do that second water change and this morning tested again. Zero! How? How is that possible? Should they not be through the roof considering corals and fish sat in poo water for 4 days? I checked ammonia just to make sure in a panic, nothing. I'm at a loss.
 
I have no idea ! But if you can find a place to put in some chaeto it eats nitrates up (and magnesium )
 
Yeah I thought about that but the way the back is set up it was going to be more trouble than it was worth. So I went with the Matrix instead. However next build is going to be out of nano range and have a sump. I am a beginner so this is all new to me.
 
Would not fit. Too close to the wall, too much crap already in the back for it to fit, expensive lighting. Pretty much was going to ruin the aesthetic. I am one of those people that want the inside of the tank to look as great as the outside. You can not see any of my equipment, except for the kessil which is a piece of art in itself I think.
 
I have no idea ! But if you can find a place to put in some chaeto it eats nitrates up (and magnesium )


Magnesium? I do not believe that noncalcifying macroalgae use enough magnesium to be significant. Relative to other ions, such as sodium, it is actually excluded from many macroalgae. Most seaweeds contain very roughly 1 mg/g of dry seaweed:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3667364/

So to drop the magnesium in 100 gallons of tank water water by 10 ppm (hence needing to export 3,785 mg) , you'd need to export 8 pounds of dry macroalgae (which would be far more in wet weight). Further, since in the above article, sodium is actually exported in far greater amounts, once correcting for salinity changes after the macroalgae is removed, you might actually find magnesium rises.
 
Resently lost power due to a wind storm. 4 days, 3 nights. I had a generator running two heaters and one pump. My tank is a 45 gallon nano. It's a deep sand bed and the tank is still new. I have been having on going issues with nitrates being much to high. Before the power outage I was winning. I had them from 40+ down to 20. I achieved this by adding more flow in the way of larger pumps so that more water would be moved over the filter media, and I added Seachem Matrix in one of the baffles. I also did a thorough cleaning of the back chamber, (it's an AIO) and added an extra WC each week. Last but not least, I got a pack of reef worms. Before the power outage I was at 20. Then we lost power.

It's cold here so tank dropped from 80 to 73, even with gennie running heater. I didn't have enough power to run the main pump so I could only run a smaller powerhead for water movement. So no water is moving over media. It was like this for three and a half days. When power finally came on I did an emergency WC. Planning on doing another one in two days, I decided to test the water. So exactly 48 hours later I test tank. All parms were spot on except PH was a tad low, for me, and alk a bit high, but my nitrates were less than 5. I used red sea kit, and my old API. Both were the same. I ran test twice to make sure. I didn't do that second water change and this morning tested again. Zero! How? How is that possible? Should they not be through the roof considering corals and fish sat in poo water for 4 days? I checked ammonia just to make sure in a panic, nothing. I'm at a loss.


I'm not sure why the nitrate appeared to decrease. I could speculate (such as possibly low O2 resulted in more denitrification, since low O2 is required for bacterial denitrification), but that may not be what happened. :)
 
Low O2 makes a lot of sense and I will tell you why. Blankets over the tank to hold in heat. Lots of them. The struggle was real man. It was a real fight. I had two air powered air pumps but with the blankets over the top...you know. So today when I do another water change, and test again. Will I see them go up? Or was this power outage a blessing in disguise?
 
Low O2 makes a lot of sense and I will tell you why. Blankets over the tank to hold in heat. Lots of them. The struggle was real man. It was a real fight. I had two air powered air pumps but with the blankets over the top...you know. So today when I do another water change, and test again. Will I see them go up? Or was this power outage a blessing in disguise?

If it was extra denitrfication, that period ended when O2 rose, so I'd guess it will go back to the same relative change in nitrate. So if it was falling before, it may stay on the low side and re-equilibrate at some lower level than before, but possibly still detectable.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • No.

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  • Other (please explain).

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