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I just did another 10 gallon water change, which didn't change the color on my ammonia badge at all. I'm mixing more up for another change in a couple hours.
It won't change color immediately - it can take several hours. Are any of your fish breathing heavy (a symptom of exposure to ammonia)? Something ain't right, you shouldn't be getting this much ammonia with 7 fish in a 40 breeder.