Depends on the size of the bows
What footprint are we talking about here? 80 isn't exactly a "standard" size. In my 75gs 48x18x20 I have:
Tank 1: 14 Boesemani. 7 Adults 6 sub adult and 1 unsexed fry. These guys can grow to 5" if they live to 5+ years.
Tank 2: 14 Melanotaenia affinis, Pagwi Local, Goo obo Falls. Not sure of male/female ratio. I haven't really counted yet. They are sub adults. Will grow to 5"+
Tank 3: 9 Glossolepis wanamensis, three or four males, five or six females. Juvies. They will grow to about 4", probably bigger if they live long enough.
Bows are a little like clown loaches. They will take a year to get to "adult" size, but they do not stop growing. So that size you see on the web of "3 inches max" is only for SOME year old Boesemani. They will continue to grow as long as they live.
Julie Zeppieri, on the rainbow list, has been keeping Boesemani for 10 years and she had a 9 year old bow that she called "Evil Old Man". He was almost 6" in size. He also killed anything she put in his tank, so he had to live alone. She lost him recently in a move, so he didn't even die from "natural causes".
FWIW my Boesemani adults are 3.5" and not quite a year old yet.
NO!
I am not a big advocate of mixing bow species. I've kept bows mixed and with community fish and IMO and IME they do much better and behave more "naturally" if they are in large schools with their own species.
You may also have some aggression factors if they are mixed. It really depends on the individual fish you get because you usually, unless you buy from a reputable breeder, have no idea where they come from.
Roan