I'm a new goldfish owner and I acquired him unexpectedly, so while his tank is cycling, I'm trying to make him as comfortable as possible. I'm trying to keep a close eye on the ammonia level (testing at least 2x a day). I don't feed him much, once a day and a small amount that I make sure he eats. My problem is that no matter what, I can't seem to get a reading of anything less than 0.25 ppm. I haven't been able to find a test kit with any smaller increment than that, so I'm wondering if these kits will show 0.25 ppm if there is any trace of ammonia? For example, when I got up this morning, I had a reading of 0.25 ppm so I did a 20% water change. When I got home from work, I had a reading of 0.25 ppm so I did a 30% water change. It's an hour later and I'm still getting 0.25 ppm. Can something be adding ammonia to my tank, like the gravel or the filter? I know the tests work because when I test the water I'm using to change, it reads 0 ppm.
I have a 10-gallon aquarium, with an AquaClear Mini Filter (with a foam insert, an activated carbon insert, and ammonia remover), a Tetratec AP50 air pump, gravel, and five plastic plants. I was using Testra test for Total Ammonia, and today I tried the Jungle quick dip strips. I've also tried a kit by Aquarium Pharmaceuticals which does show 0, but the first level is would show is 0.5 - 1.0. My goldfish has shown signs that he's very sensitive to ammonia, so I want to be careful. But I don't want to be changing the water too much either. I used Bio Safe (by Marineland Labs) initially to treat the water, and Bio Coat for the water changes. My tap water does not have ammonia. Today however I did buy the AmQuel and NovAqua I've been reading about, so maybe that will make a difference.
Any ideas? Thanks.