I've got 7 of them. They are great fish. They don't touch most fish. The only problem I have had is silver fish, I think Exo's are naturally scale eaters. I had two Red Tail Baracuda's striped of scales and killed over night. They are currently kept with some Botia and small immature Channa Pleuro's. They are very entertaining if they are kept hungry as they then tend to attack food items on mass.