I prefer to keep my fish in a species tank when possible I also know what combination of livebearers can be kept together
redtail splitfins introduced to the UK fish hobby in 1972 back in the day there was not a lot of information about this species many fish keepers tried to keep them in community tanks with long fin Guppies and other slow moving fish the redtail splitfins soon got a bad reputation of being a fin nipper. they're not as bad as they have been made out to be I find when kept in a group of 8 or more they tend to not bother other fish kept with them