The majority of Cichlids have become known as pretty aggressive species with very limited compatibility. Unfortunately, Flowerhorn Cichlids are not an exception.
Don’t be discouraged though, there are still some fish that can be kept with them if you carefully plan.
Because this fish was bred artificially and has never really left the tank, we can’t say for sure what fish they would be swimming along with in the wild. However, we can analyze the compatibility of their ancestors and go from there.
It is better to either keep these fish alone or in pairs. First, the aquarium should be at least 150 gallons if you will be keeping Flowerhorns with other fish. This is to avoid conflicts and keep fish healthy.
The best tank mates are usually fish of similar size or slightly bigger with a similar temperament, for example, Pirapitinga, Leopard Pleco, other Plecos and Jaguar Cichlids.
Other fish that would make good tank mates include Giant Gourami, Oscar Cichlids, Suckermouth Armored Catfish, Spotted Hoplo, Spotted Raphael Catfish, Lowland Cichlids and Bushynose Catfish.
The Flowerhorn will not be a good match for smaller, slower fish.
If their neighbor is significantly weaker, they won’t hesitate to attack them. Also avoid small fish that are overly active because these will often cause trouble by irritating Cichlids.
Keeping Flowerhorn Cichlid Together
Flowerhorn Cichlids can be kept together but their aggressive nature makes keeping them together difficult.
It is not impossible but you would need to ensure that there is enough free space for every individual (150+ gallons) and they all get enough food so they would not have something to fight over.