Sorry to be a party pooper here but....
I have had dovii do from 2.5" to 12" in about a year.
I think a beani (1) could live in a 75 for life, but with no other fish.
Maybe a pair of istlantum (maybe)
but beani will become very aggressive at a small size, much before the dovii, and and an alpha male would take the dovii out in a 75.
I believe putting all those similarly predatory fish together in a 75, even at a young age will not have a happy ending for all but 1.
My male beani makes a 150 tank a living hell for all, but a receptive female.