Not sure on the different species if any but another choice could be Tinfoil barbs and Flag Tail Prochilodus. They get large enough to hang with the big boys
They have never had live food ..and to be honest the synspilum has been the only aggressive one[so far].
He took out my blackbelt and my jag..
But he never messes with dovii or red devils.
Hence this thread i really don't want to keep putting 60 dollor fish in there to be killed.