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Goldfish turning black


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Hi! This is my oranda goldfish that I got a month ago. He’s slowly been changing color ever since I took him home but recently it became very noticeable and more severe. He has been in a 55 gallon with another goldfish and some dojo loaches during this time. I’ve been trying to do a fish-in cycle in that tank by putting in 5x the dose of seachem prime (the max the bottle says is safe) to try and detoxify the ammonia until it’s cycled to keep them safe. Could this be ammonia burn or is it something else? I just took him out of that tank and put him in a 10 gallon with perfect water parameters so I could get a better look at him. The first three pictures are from today, the next two are from November 12th, and the last one is from October 20th when I first took him home. My other goldfish and loaches seem to be completely fine.

These are the current water parameters of the 55 gallon (there is 5x the normal dose of seachem prime in it right now)

Ammonia: 4.0 ppm

Nitrite: 0 ppm

Nitrate: 5.0 ppm

pH: 7

Temp: 70°F







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As @Scapeghost said goldfish change colour as they grow so normal, I have read that it can be affected by light so you could do some research on that. I believe low light makes them pale but how much this affects the fancies I'm unsure.

For reference since you are doing a fish in cycle  Ammonia burn looks red and sore and does damage fast. You will see it on delicate areas first (tails fins and harderv to spot gills) act fast if you it does a lot of damage fast and recovery is slow.

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