Mid Provo midge hatch

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Hit the middle again Saturday. As the last 3 weeks, great midge hatch going off for about 2 hours. Fish are eating some type of midge on the surface, but can't figure what it is, any ideas? Able to fool a few with 18-20 Griffiths gnats, but that is not the right pattern, any ideas? Did manage a couple myself and got my friend his first fish on fly rod and on a dry Griffiths gnat, so he is hooked now.
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