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This is thin layer on bottom of watter stream (1-2 cm deep):
img: http://agrozoo.ne...1bde1a7ec2

Uper image all the stuff there is. The rest of stream christal clear.

Slovenia, Alps, about 1500 amsl, watter stream comes out of rocks and submerges in couple of m.

I seen inside one of bubbles watter fast spinning, mybe micro air buble inside.

None popped or expanding while watching, hence I think some kind of animal ?