IMO from least to most peaceful
Kribs (in a breeding pair they can be very territorial - alone still agressive but ok community fish if u have the space)
Rainbow Shark (Ok as long as enough space to have own territory. Do not keep with other rainbow/red tail sharks)
Bleeding Hearts (can be fin nippers if not kept in a shoal)
Black Ruby Barb
Rummy Nose Tetras,Platies, Scissortails all peaceful.