Sick comet goldfish

I have a 55 gallon tank with 8 comet goldfish all of them where fine the first 2 days and last night tehy developed a blue color on the bottom o fthem

Answer #1

It’s quite normal for goldfish to change colour slightly as they mature…as long as their behaviours don’t change, it should be fine.

If you notice the colour of your fish is becoming dull, however, it means there’s a problem…it could be because of food that’s poor quality or worms or parasites.

Answer #2

I just set up the tank on sunday. I went to the store I got them from and they never heard of that happening

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