4847
Similarly-shaped fishes should be avoided, but can be maintained alongside peaceful schooling species with comparable environmental requirements.
Males are territorially aggressive, this behaviour becoming more pronounced during reproductive periods, and should not be housed together unless the aquarium is very large. It is also advisable to provide two or more females per male in order to disperse male attention.
https://www.seriouslyfish.com/species/macropodus-opercularis/