convention would say very small flies, on 1lb - 2lb tippet ish.
However I have to say all my roach/rudd have come on trout lakes to 5lb tippet and size 12-14 black and peacock so who knows! Can be hard to hit the bites but good fun and lovely looking fish.
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Around the steel no tortur'd worm shall twine,
No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook,
With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray,
And with fur-wrought fly delude the prey
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