Sorry mike can't be there to help you catch the fish, unless you can wait till next tues when i'm back from outstaion.
Here is a trusted fish trap that i have used to catch all sizes fishes from purple tang, yellow tail angel, flame angel and eibli angel. The only fish that manage to escape was the 6 line wrasse which i forgot they burrow into sand.
Its a Mesh that you can find at any DIY shop and made it into a cylindrical shape using cable ties.
Once its done remove all your acans except the bait, place your acan (bait) into the trap. Let the fish know that the only place for acans is in the trap.
Raise the trap above the bait and wait for the fish to enter/try to nip the acan.
Once its in you can shut the mesh and it will be secured due to the sand holding it down.
All the best,