I'm not so sure that my leather coral is doing well. It extends long, thin tentacles at night, but during the day it doesn't show any tentacles. A few days ago I witnessed white smokey stuff coming off of it, and I researched it and figured it was just cleaning itself, but now it looks white and unhealthy in several spots, the edges of the coral are the only thing that's brownish pink and the tentacles there extend themselves a bit.

I'm worried that it's getting too much light. Is that possible?
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(the image is sideways)