yes all rules can be broken
your system is plenty big
i've seen a tank with 10+ different tangs all happy
just make sure there all well fed so they don't fight
i just got the same frag about a month ago - mine is still brown(tips are purple) but hoping to color up purple fully
saw web page where it's called the fugi purple monster
look at the tank at night you most likly have hundreds
they usually come out at night
there a great clean up crew there able to get into the smallest of areas
my lfs said becuase of the intensity these bulbs can cover 4 ft and 6 feet deep
the cost between 2 400w and 1 1000 is not much so why not upgrade
i was thinking of putting one on a 94g corner instead of 2 400
you can't match the intensity of a 1000