Popping head and a big, dark fly below between 20 and 80cm below it depending on what the fish are doing.
The fly honestly isnt that important as long as it sinks very slowly, lands with a bit of a "splat" and has a crap load of movement. Something like a #2/0 black zonker, with the zonker palmered forward over a red/orange yarn underbody for a bit of contrast is ideal.
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