Sounds fine. As long as it's eating don't worry about it, just make sure you temp/hum and light schedule is right. I'm sure you've done your research and know the care requirments by now if you've found this forum. As previously posted, nocturnes such as White's are usually inactive during the day and brown is just one of the colors of the spectrum.

These are really easy to keep.

If you have any more concerns don't hesitate to voice them, this has been a knowledgable forum in excess of 10 years.