Staxx, I have 12 barbs (4 each of tigers, green & albino) in with beacon & lemon years & harlequin rasboras and never had a problem. I had 8 in with them in a 120 litre tank with no probs either. The barbs just tussle between themselves so far as I've ever seen & I've lost none of my other fish so from my experience I'd say they will be fine just so long as they are in a big enough shoal to help ease aggression. Plus, they are ace to watch & generally very active!! .
Where abouts are you & minnt?
Those apistos are fab ... I'd have them if you were nearby or willing to post?! . Think they would look fab in my 5ft tank, though suppose they will look ace in staxx tank too!! Lol.
Staxx, hope you get the fish you want. Have you any piccies of your tank?
Oh I wouldn't worry bout mollies, my lone mollie was bullying my new albino barbs over a bit of cucumber!!!! Lol