Wtb fish trap

[Reefpharmer]

hi guys, I am looking to buy a fish trap. I have a dottyback that lives in the rockwork and I cannot catch it for the life of me.

I tried bottled, tried turning the lights on at night and tore down half the tank of rockwork without finding it. (Guess it was in the other half)... its black which makes locating it in the dark (or where it sleeps) more of a challenge.
Thanks !