If they have being in the tank for a while, they are accommodated to the conditions. Or they are more resilient. Or it's not bad water; but without a test you just wouldn't know.
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I was planning on taking in a water sample to the store today, but my foster dog came to me matted & in seriousness of grooming, I spent hours fixing him up. Priorities... ): no time to go to the store. I'll do it tomorrow. I still don't think it's a water quality problem, I am good at keeping up with water changed. At least 50% each week.
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