Yeah the really good ones dont require tanning ..
But heres an example this fish was 2 years old and looked like this.
The same fish after moving to a outside tank 1 year later..
I think lighting plays a part in the red arowanas color but Iam not too sure.
View attachment 1289446
View attachment 1289447
that's a very big difference but my understanding is if it is tanning, the color will not be perm...
so has the red been maintaining the color