To clear confusion, the powder brown is a Acanthurus japonicus. Will A regal and a powder brown get along in a 100 gallon? 48" long x25"x25". It will have 100 pounds of live rock and a 30 gallon "duplex" design sump/fuge. Also how long are both of their lifespans in captivity? Does anyone have nay first-hand experience with power browns and if they are difficult to keep?