dechlorinated tap water is changing my water parameters

  • We are currently upgrading MFK. thanks! -neo

niqolas619

Feeder Fish
MFK Member
Mar 21, 2007
51
0
0
45
Chicago
I posted something about this a little earlier, but I was a little sketchy with whether or not there was actually something wrong with my tap water - now I am almost completely sure that there is.

I've been adding ammonia, testing the water, and not cleaning my tank or doing water changes for a while now (maybe about a month or so, with a few setbacks along the way). Today, I tested the water and I had 0 ammonia, about 2 nitrite, and around 40 nitrate. I thought this was a little wierd, because I thought that I should have 0 nitrite if I have that much nitrate. I repeated the test to make sure I did everything correctly, and got the same reading. My tank has lost some water due to evaporation, so I decided to top it off with 5 gal of dechlorinated water. I tested my water again about an hour and a half after adding this water, and I still have 0 ammonia and about 2 or 3 nitrite. The nitrate, on the other hand, dropped all the way down to about 5 or so. What is going on? I don't think it's just a case of the nitrates being dilluted with the added water, because 1) the nitrites didn't dillute at all, and 2) 5 gallons wouldn't be enough to drop the nitrates that far in a 55 gallon tank. The water had only dropped about 2 inches, so it isn't like I added 5 gallons of new water to 10 gallons of 'old' water.

Has anyone had experience with this kind of thing? When I was in San Diego, I used bottled water for my water changes, but this was pretty cheap (about $1 for 5 gallons). I don't think I can get water that cheap in Chicago. Also, any ideas on why my nitrate was so high while still having nitrites? The nitrites have been hovering around 2 for about a week now, and the nitrates have been about since I began cycling.

One thing that I just thought of - I originally used Cycle to start the cycling proccess about a month ago, but have now read around that this is a bad product that can prolong the cycling process. I did about an 80% water change a week ago when I thought that my tank was cycled, so I would think that this removed most of the Cycle product that may or may not still be in the water.

Thanks for reading all of this.
 
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