Native
The paradise fish or paradise gouramis (Macropodus opercularis), are small freshwater labyrinth fish found in ditches and paddy fields in East Asia, ranging from the Korean Peninsula to Northern Vietnam.
Description
These small fish (adults are typically about 4" (10cm)) are ideal lone inhabitants of aquariums, being physically robust, somewhat colorful and more alert/behaviorally interesting than goldfish. The paradise fish is one of the more aggressive members of its family, by being more aggressive than the blue gourami. Yet they are far less aggressive than the rarely kept Combtail. Paradise Fish are fairly combative, harassing and attacking each other as well as potentially killing small fish. In the wild, they are predators, eating insects, invertebrates and fish fry.
In an aquarium male paradise fish should be kept apart, since they will fight aggressively by locking jaws. Male can be kept with females; females may also be kept together in groups. Paradise Fish are often aggressive thus tankmates must be chosen with care. Suitable tankmates include large tetras,most smaller catfishes and even some of the less aggressive cichlids,such as firemouth cichlids. Slow moving or long finned fish such as fancy goldfish and freshwater angelfish are likely to be attacked, gouramis may also be victimized due to their resemblance to paradise fish. Male paradise fish may also attempt to court female gouramis. Small fish less than 3cm are likely to be consumed. Males are particularly aggressive and should not be kept with slow fish or fish with long, flowing finnage which is commonly shredded by the territorial paradise. In a community tank, male Paradise fish fight other paradises, as well as any other fish for dominance. Paradise fish will often fight with other fish for dominance, particularly other aggressive, robust fish, such as cichlids, gouramis. They therefore should not be housed with any other fish which may attempt to challenge them, because this leads to fighting.