Upland reservoirs = central catchment area? Seletar, Mandai...
I live in the North so my water is probably from this source, which NO3 range from 0.5 - 15ppm.
I just got a AP Nitrate test kit and found that my NO3 level is 20ppm!! no wonder I'm getting all sorts of algae problems despite good plant health and high CO2. My tank is all glosso so nutrient uptake is slower than rojak tanks so I guess the N from tap water is enough. I have 28 cardinals, 10 Yamatos, 6 Otocinclus. Feeding 1 or 2 times a day. I guess my bioload can maintain the NO3 levels.
I'm gonna stop dosing KNO3 but where do I get my K? Seachem is a little ex when I do my own PMMD.
If my bioload is too high and contributes too much NO3 even when I follow a strict 50% water change a week regime, what can I do to reduce the NO3 level? I don't want floating plants as I want my glosso to get full lighting.
My NO2 level is almost zero or immeasurable, I'm using Bioplast tester for this one. So I guess my biological filtration is pretty efficient.
Do I need to check on PO4?
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EDIT
I just tested my tapwater. the NO3 level is close to zero so I think most of my NO3 originates from my tank. I did a 60% change and got a 10ppm reading. I'll change again on Friday to get 5ppm then see if it rises.
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