How many do you have and what color are they? The problem with damsels is that they are territorial - some moreso than others. But it can cause trouble. That being said, there are many fish with this issue, including some clowns, dottybacks and grammas. Small fish, big attitude.
I had a striped damsel that I had for like 8 years. He had rule of a 15g and would attack me when I cleaned. But he was also very cute, and survived my years of ignorance in the hobby. So I felt an obligation to keep him. And he was cute, deep down, with his little frown that earned the alternative name of "humbug" damsel.
But a tank of them, IMO, would be a bit much. I don't think you would want that.