Fish less than 3 cm are likely to be consumed. If kept with significantly larger but non-aggressive fish, such as "Geophagus" cichlids, large "Synodontis" catfishes, or larger gouramis, they are usually submissive and do not act nearly as aggressively as when they are the dominant species in the aquarium. However, they themselves can be bullied by similar sized or even smaller fish if that fish has already established territory in the tank which it is not willing to share or give up. If this is the case they will not even attempt to fight and will take to hiding behind filters, plants, or in décor, and will succumb to stress.