Blue Gudgeon Dartfish exhibit agile swimming in mid-water, forming small groups for safety. They are peaceful, showing minimal aggression, and prefer to inhabit reef crevices. While not overtly territorial, they defend their immediate area when threatened. They coexist well with other non-aggressive species but may be shy around larger, boisterous fish. Their social nature makes them suitable for community aquariums, provided tank mates are calm and similar in size.