This might be a tough question to ask, but we just bought 6 Madagascar rainbow fish from are aquatic store here locally and within 2 days every one of them had died, and I'm trying to figure out what went wrong. My tank has been cycled for many months. All the other fish in my tank are thriving. I have an angel fish, 5 cory catfish, 6 zebra danios, and 5 Bossemani rainbow fish. They all are doing fantastic and have been for many months. I don't know what the issue could be. Could the fish have already had a problem when I bought them? We were on a waiting list for those particular fish for 2 months. My tank levels are pretty much always 0 ammonia, 0 nitrates, 20 nitrates (tap water has nitrates), 77 degrees. Any advice would be much appreciated. Thanks
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