I had 2 of those in 29g. They stayed away from clownfish but bothered every fish that was introduced to the tank. They are less aggressive than other damsels but still aggressive.
X 2...I had a breeding pair years ago and like many Damsels they may get more aggressive with maturity especially when nesting. Even though the Chrysiptera species are not as aggressive as some of the other species like Dascyllus they are still Damsels and will defend a territory.
Unlike Chromis I bought 6 and still have 6 of them for over 1.5 years now. They are fine. They bicker amongst themselves for territory but are not a threat to any larger fish. I added a 6 line wrasse a year later and 1 or 2 talbots picked on him for the first day, once the wrasse settled in it was not even a issue as you can imagine.
i just got one today. It fit right in and adapted to the environment well. the tailspot blenny established dominance in the tank. the neon goby in the tank is just there, no one bothers it. the tank is an 8 gallon biocube reef tank. thanks for all the input guys.