Long ago in a 90g I had a threadfin butterfly fish and a double-saddleback butterfly fish living together for over two years (they got along great, easy to feed not shy) I LOVED them sooo much.
But I got greedy and after two years I added one more butterfly fish it was a kleins and it didn’t eat, got sick and in the end I lost all three of my fish and was very sad.
I think three long-fin banner fish would beautiful in your tank
I’ve never seen them for sale, but my favoutire butterflyfish would be a pair of masked butterfly fish!
Either way excited to hear about what you end up getting