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[APD] "Grainy" or "sandy" water??
I have been noticing for the past month or so that my water seems to be
grainy or sandy. And recently it has gotten worse. The water looks a bit
cloudy white but when you look closely you can see what looks like fine
particles suspended in the water. It's worse when you look "end-on" then it
looks almost like a sandstorm in there...
My water parameters are all fine. 200l tank, heavily planted, CO2 injection,
125W of light, 29C, pH=6.6, KH=3, PO4=0-0.25, NH3=0, NO2=0 and NO3=10. I do
a 35% water change every two weeks with a mix of RO and tap water to get KH
down to 3.
About a month ago I added 4 discus to the tank. Since then I have fed the
fish a couple of times with frozen beefheart and bloodworms (they love the
bloodworms!). Otherwise I just feed flakes and granular discus food. I have
increased the number of times I feed them to 2 or 3 times a day (before the
discus I fed once a day).
The only other incident is that I have been suspecting my pH controller
probe to be defective because at each calibration (monthly) it was having to
adjust by between 0.2 and 0.3 pH. Also when I measured pH with a liquid test
it was showing me an aquarium pH quite a bit higher than the pH controller
was (6.9 vs 6.6). I took the probe back to the store and they gave me a new
one to replace it and now the pH is where I want it to be and matches liquid
The above means that for several months now my aquarium was getting about
half the CO2 it should have been getting while I was still dosing
fertilizers normally as if the CO2 level was good.
I put some "ultrafine" mesh pads in the filter two days ago to see if this
would help and I see no difference.
I've been thinking that the "dust" in my aquarium could be:
- excess ferts precipitating out of solution because the plants didn't have
enough CO2 to use them all?
- Related to the increased feeding frequency (even though each feeding is
- My substrate is 4cm of Dennerle Deponit covered by 5cm of gravel. Could
the "dust" be from the substrate?
- Anything else?
Sorry for the length but better that you all have as much info as possible
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