It will be hard to keep the water quality high enough to keep those anemones alive (not to mention all the corals).
What kind of damsels are they? Many get HUGE, ugly, and VERY aggressive. Because of their size they will create a lot of waste. Their aggression could lead to the end of the clownfish and prevent you from adding almost any of the usual reef fish (including some that can be very useful in a reef tank).
When I was running a LFS
we wouldn't even carry damsels because of how aggressive they are.