04-16-2009, 09:01 AM
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Originally Posted by MBilyeu
I wouldn't try a different sand just yet, it seems like what you bought is the right stuff. I have been trying to research this, but I can't find anything on silica affecting the outgassing of CO2, which seems like a possibility of what is happening. I would do another water test from the tap in a plastic container for pH, then wait for 4-5 days and test again to see if there is any outgassing that occurs naturally. Since you did a one day test with and without sand, it might be that the sand just speeds up the process. I would also test the kH of the tap water and see if it is unusually high for what you tap pH is. It could be that the pH is just catching up with the alkalinity of the water. If it is one of these causes and you put peat moss in your filter to lower your pH, then you will run the risk of stressing your fish at every water change. If you find out that it is your water reacting, then you might want to look into an RO unit if you are really in need of low pH.
the water im using is filtered thru a water softner. i also have a RO unit but it only produces 10g at a time. i just checked again and the PH has seemingly lowered in both my test sample and the tank.
the left is my tank the middle is the test water with sand and the right is the tap. unfortunately my softner went thru a cleaning cycle last night and the ph has been altered. but the sand waters have definetly gone down overnight. they use to have a purple tinge in the indicator. the color i got in the pic is exactly what the tap was yesterday.i think i will be ok. i usually do wc right after my softner cycles, so i get the lowest ph possible from the tap. im am not planning on getting any super sensitive fish, just some tetras, cories, rasboras, and maybe a couple of plecos.
i have to go to work now. i am going to set up a third sand test with the new ph from the tap, just for fun. ill see how it goes when i get home.