With 5 tiger barbs, you shouldn't have too many problems with them being nippy as they will be busy chasing each other all over the tank, if they are anything like mine. I have had excellent success keeping tiger barbs with black skirt tetras, serpae tetras, swordtails, platys, corydoras, a lg pleco, clown loaches (they all thought they tiger barbs as well!), green spotted puffers, and for a time now they have been in the tank with my gymnogeophagus bahia red cichlids. Some bottom dwellers such as loaches or corys would be nice, maybe even some catfish varieties depending on how many fish you want as some of these can get quite large! Good luck and happy fishkeeping!
Allie