hi i would like some advice on wot is best at this time on rivers i have tryed a black gnat but no luck. shoud i try a buzer and wot sort should i use

i have seen small black buzzer's hatching in the margins of my local river .these are just midge pupa that will inevitably become midges, yes the little annoying things that mass our heads ,and drive us to madness!!.
I have tied up a couple of small black ones with a CDC tuff to try out some time, and im sure they will work ,as their has been a few days when all i can see is these small black buzzers hatching in the margins ,and fish taking from just under the surface , so i take it they are feeding on these at the time.

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dont you just love nature