"Chief Ephor" wrote in message ...
hi.
I agree with KC.

FWIW, all my green acrops turned purple or brown in past two years, and I
have real hard time keeping green color except _A. yongei_. I switched from
blue-filtered 6500K to 20,000K, and it may has to do with either color,
wattage, or both.
bye -ck-

Just as an addendum, I have had a brown montipora in my tank (VHO
only) for about a year and a half. It was a very fast grower, but was
not very colorful; brown. After installing the MH light, I started to
notice the tips appeared a bit pink, but thought that perhaps it was
just reflections on the coral. Well there is no doubt now. All the
pieces of the brown montipora that are exposed to the MH are indeed
growing quite a nice light pink color. At last, a pleasant color
change!