I have two Damsels in my 4 foot Aquarium, I am not sure of their names but
the shop owner said one was Black Back and the other Two Pac.
One is BRIGHT Iridescent blue along the top half and from halfway down it is
bright orange, the other has a yellow forehead and a diagonal black stripe
from the lower lip to his upper tail and white from the black stripe down.
Both fish leave each other alone and dont attack each other or any of the
other fish I have in my tank.
Every now and then they will stand their grounds but they dont go around
chasing each other or any other fish.
But with age this may change from what I have heard.
And also it really just depends on the fish themselves as to how aggressive
they may be...

Cheers
Microbot

"Kevin" wrote in message
om...
I have recently set up my first marine aquarium. It is going quite
well so far, (save a slight red slime problem i am trying to control).
I have put just one fish so far, a small yellowtail damsel. I would
like this to become a reef tank, and i did use the damsel knowing it
was very hardy and would assist in cycling the tank. I have been told
by the local fish store they can be quite agressive despite their
smallish size. What are your experiences and opinions about their
compatability in a reef tank and with other fish, and have you found
them not to be suited to this? Also, have you found any difficulties
in maintaining them with invertibrates, especially small hermit crabs
and cleaner shrimp?

Thanks for your input.

kevin