 It is not a safe tank mate for fellow tetras because it will eat small fish and it is not a safe tank mate for larger species because it is a notorious lepidophage.Bucktooth tetra are best alone or in large planted tanks with adequate coverage for other species.They are best kept in shoals of 8 or more; a shoal that is less than 8 will pick at each other and stress the exodons to a point where it will catch some disease or will die of severe wounds.