I have aphyosemion australe, or lyretail killis in a 125L. Killis are great wee fish. They were being regularly harassed by the barbs, along with the pygmy corys and corydoras habrosus. They would even try chasing the apistogrammas, though the apistos would sometimes give as good as they got. The barbs were the very first fish I aquired, knowing nothing about fishkeeping, and the LFS said they were peaceful community fish. They haven't been; I had to shift them out of my first tank because they were fin-nipping my longfin bristlenose. The denizens of the 125 seem much happier now that those jerks have moved out of the neighbourhood.
The barbs now live in a 100l corner tank and share it with the Bolivian ram, a refugee from my 240L which I made into a hillstream tank.