I think I read somewhere that acei most times than not dont work in a 55g because their almost to big for a 55g. My husband and I really like the looks of the red shoulder peacocks... Would peacocks be ok with just labs?
My Acei did fine in a 55, but they do get quite big. And red shoulders are cool cichlids! I have never owned any, but after doing some research, i think they seem fine! Every website I read said that they are generally peaceful and not very aggressive, which sounds to me like they would be a great companion for the yellow labs! Try to have a decent amount of rockwork though as they are mostly rock dwellers.