[comewithme07]

Hello Everyone,
A couple of months ago i moved to a new location away from my hometown.
After setting up my tank i see some plants are significantly uncomfortable so i decided to check my water parameters.
I am using ground water and its literally a solution of CONCRETE..!

100 Gallon tank
~420 Liters Water ( Display tank + Sump )

Water parameters (Ground Water):

pH = ~7.2
Ammonia = 0
Nitrite = 0
Nitrate = ~80 ppm
Phosphate < 0.25 ppm
GH = 22
KH = 20
Substrate = ADA Amazonia Light
Temp= Remains approx 28 Celcius through out the Day
Results Twice crosschecked.
Above parameters are NOT OF TANK WATER.

I'm EI guy
But here in this situation I'm fully confused what to do with the Nitrogen part... I think i can't dose Potassium Nitrate because its already insanely high.
Whats about Secondary Macro nutrient like Calcium and Magnesium ....TO dose or NOT to dose.

Worst suffering plant is Monte Carlo growing toooooooo slowly but no signs of melting or rotting. Any reason ?

Here are some surprising things... I'm just clueless how things are happening.

I have Guppies and Tetras in my tank ... though Nitrates and KH pushed out of the limits.
I've Rotala Macrandra top portion is turning red even after having such high nitrates.

 

[hoppycalif]

You can dose potassium as potassium sulfate, K2SO4, without adding more nitrates. I assume you are dosing KH2PO4 for phosphate? No question, your water is hard water, but most plants should be able to adapt to it.