Butterfly tank size?

[Guatney]

Im planning on building a FOWLR tank after i get rid of my cube. what would my minimum gallons have to be to keep these fish?

Banded Butterfly

Pakistan Butterfly

Purple Tang

 

[mcintosh]

The purple tang should be kept in a minimum of a 6 foot tank for a good long life. I am assuming the same could be said for the butterflies. I know the Pakistani bfly would be fine, banded should be also. So go for a minimum of 6 foot long tank.

 

[aquaph8]

I would shoot for 180ish.