Goldfish Black Smudge Under His Head.

killmekaze

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Help my oranda goldfish started showing black coloration under its head. I'm not sure if this is normal or should I start treating it for black smudges.

20 gallons tank, 2 oranda goldfish and 2 nerite snails, tanks is cycled, 40% water change every week, saki hikari is their main diet and some spinach, I dont know the ammonia levels since I dont have a test kit. Fish is still active and eating.
 

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