More information would help. Is it a new coral that is slowly getting darker brown? Did it suddenly get a brown spot one day? Is it an old coral that used to be yellow for years then went brown?
There is no special conditions to make a leather yellow, it either is or isn't. Often times a newly shipped one will appear more vibrant due to stress, and when you take it home and make it happy it will darken to its natural color. Or if it was a nice color for a long time and changed, something has upset it and you need to share test results to figure it out
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