Nitrite(NO2) spike, Unexplained???
Established tank of 3 years.
Med-Hi light, 1/2 EI dosing, CO2(30ppm) etc...
Walked in the door this evening and noticed a surface scum.
Grabbed some water for a testing.
GH = 7
KH = 3
Ca = 30ppm
NH3 = 0
NO2 = 2+
NO3 = 20ppm(relative to EI dosing)
PO4 = 1.5ppm (ish)
Used a small container to start the water change by skimming off the scum.
Seemed yellow and clumped when in the cup, very slimy too.
Then began cleaning and found all 5 Amano shrimp dead(recent death).
I am sure the NO2 did them in, they have been kicking for over a year and some at the two year+ mark.
Shame it didn't kill the pond snails. Fish are okay, changing water now.
So the puzzle is how does one just accumulate NO2?
Ammonia @ zero and nitrates right @ about dosing levels?
Tested NH3 on Friday for this tank and reading of zero.
Typically an established tank will show ammonia or nitrate elevations.
May not ever see the NO2 levels increase during this process.
Nothing has changed in this tank for 6 months.
Weekly 20% WC's are all that's going on.
Other than way too many plants.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Growing is not that difficult.