#2
I am a bit more cautious and say Lipara sp. (but if thay come from the photographed gall, they should be lucens). Besides, some other chloropids can be reared from Phragmites (long ago I reared some), but these are much smaller.
#4
Ok, thanks so far. Let's hope they will hatch.
As for the gall itself, I am pretty sure it is
Lipara lucens, as the other reed-inhabiting
Lipara species seem to induce rather different galls