Electric blue acara tank mates

[njr_]

I’m setting up a 66 gallon EBA tank and I have a few questions that are bugging me. I want to have a blue acara and a few other fish in there possibly Severums or other cichlids and I really need help on these things

How many blue acara should I have? Ideally I want just one but would it be ok alone?

What cichlid could I pair it with and how many of those?