These seem to be all the rage in Lembeh at the moment, so here's my video of them. These shrimp are a definite 'unknown' and have been spotted in a few places around Indonesia. They were seen for the first time in Lembeh about 6 months ago.
They are tiny and seem to like stretching from time to time, as you can see in this video. They also seem to like poo-ing, again as seen in this video.
It is worth watch this full screen to be able to catch all the detail.