Ok, here is what I havein my 75 gallon.
12 tiger barbs
20+ danios(will have to go soon, tho)
1 syno eupterus(great FINNAGE)
1 pictus cat(long barbels)
1 red tailed shark
3 siamese algae eater.
As you can see, I keep fish with long barbels and great finnage. been runnig for over 3 months and no nipping.
slo, keep in mind i have a semi aggresive community(LOTS of movement, and great colors!)
As long as you keep tiger barb in 4 or more, they pretty much keep to themselves. But be warned that all veil tail fish will be nipped upon(like someone said above). I once added a betta, and all the barbs ganged up on him. Don't worry, he is fine now, in his own little 5 gallon.