I have a 110, 60x24x18 and I got two Watanabe angelfish about 4 months ago. They were both small females at that time one slightly larger, now the bigger one has gotten much larger, and basically keeps the smaller one in a small area in the tank under normal conditions. During feeding everyone is going everywhere, but it's more aggression than I anticipated, it's not like people, if you get two females one will bully the other to keep it small so it doesn't transition. Mine are still both females at this point. I don't think either are particularly happy that there are two in the tank, maybe if it was a bigger tank, but if I had to do it over again I wouldn't have worried or focused on getting 2. They're not that social, not like anthias or anything. They're ok, but I feel bad for the smaller one, hopefully the larger transitions and calms down a bit.