[BoomerD]

I suspect, (if it hasn't happened yet), that you're going to have some SERIOUS aggression issues with 3 hippo tangs in the same 180. They may do OK when they're small, but generally, tangs of the smae species, or similar body shapes, DON'T get along for any length of time. Having multiple tangs in a 180 isn't difficult, but you have to mix up the genera and families to avoid aggression. I'd get rid of 2 of the 3, and maybe get a kole tang, or one of the other Ctenochaetus sp. tangs. Pretty non-aggressive, and perhaps the best algae grazers in the entire tang family.