You tank is like a foot long. Of course they circle it. Much smaller than usual territory, but not too bad. All tangs have a territory the size of the nearby mall. a foot doesn't cut it with them.
yep. welcome to the hobby. very expensive and choices are hard and not always what we want. even with our *VERY BEST* intentions things die in our expensive environments, so when opinions are obviously going against the experienced people here they get a mouthful. period. If you searched on this tang you already knew what the advice was, so by posting you are being a bit argumentative or else you are naive. Either way it is your decision to put dory in a cube, but it will cause you problems and be the death of the fish, and maybe your clowns too. Really.
I'm assuming you have a 30gal (ish) biocube? one flame angel with clowns might work. The flame angel might also become a jerk to the clowns and/or eat your coral. Hard call. You would be maxed out at fish at that point.