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I had the same problem, same fish, In a hex 65 gallon, stacked with rock and coral, I used a clear tupperware and a net , took me a while but I chased him in there , just have to out smart em.
IF the net fells maybe a fish trap the one I had borrowed it had a trap door on it so you had to stand there hold the string put the bait inside all the way to the very back and wait till they go in and then let go of the string and down comes door and they are trapped inside of it.
I tried it it with that fish didn't work for me, he hated me, it was like he knew I was coming for him,and he would attack me when I put my hand in my tank, but I have used the fish trap to catch other fish, work pretty good.