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At least the tail end, as he was diving into the algae.

Taken a 600x

I'm not sure what the little 'green guys' are, so perhaps you could ID them for me.

https://photos.app.goo.gl/kwz6vzTqruNZN8xv6

This one was creating quite a current!

https://tinyurl.com/yym3dshh

They certainly do David, sweeping a side other 'critters' around them.