They aren’t barbs but I cannot recall their name. Fish looks like this ? shape. We have checked water several times and it is good. We are going to change light from white to a colored lights. We have never seen a dead fish ? or even a sick one. The upside down catfish stay hidden, and they are 4 inches long , so we have never figured out who is attacking who. My other thought is rather or not I am under feeding them. They are feed once a day with flakes and bloodworms, algae wafflers. We are going to add plants to the tank too. Hopefully we will be able to add other fish to this aquarium and have a community tank.