It is a 3 part answer IME
Color can be from environmental factors (ie corals browning out), lack of reflected spectrum, and lack of wavelength intensity for fluorescence.
It is possible that it is brown and will stay brown. It could also morph color over the period of months. It could also have common orange or green fluorescent pigments (which are USUALLY displayed much better with higher kelvin MH vs fluorescent bulbs).
The most LIKELY answer is, it will stay brown, but with a higher kelvin (14k should be fine) MH or good actinics, you'll get some mild fluorescence but don't expect a rainbow
So..maybe. Not the answer you were looking for.