Koran angelfish discoloring
 

My Koran angel fish is loosing it's it's colors and has a tear on the tail fin. What can be the issue?
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My guess is that you have a Junvenile Angel and he is changing to his adult coloring.
Aquarium Fish: Tropical Freshwater Fish and Saltwater Fish for Home Aquariums

Very much possible but why is the tail fin torn.
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Either a nipper got him, or he got it stuck o a rock some place.

what are your water params?

how old is this fish? did you QT it? was it purchased in this condition? is it eating?

My tank params are all good QT and DT. I quarantined it fir 10 days with some extreme garlic. It was purchased in good condition. And I have the fish for about 15 days
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And it is eating fine
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When going from juvi too adult the colors kinda blend in together, giving it a mottled look, like its washed out. Blending all the colors together, they tend to look, "weird". White washes in also.

10 days in a QT isnt effective as disease sometimes wont show for about 10 days. if it is eating healthy thats a good sign. lets hope its just changing to its adult phase as reefing said.

QT time should be about 4 weeks,