Transparent shrimp like creature in live rock

[Fishkeeperontheroof]

Hi can someone please I'd this critter for me? I've been searching and cant find anything that resembles him anywhere online, he is massive in terms of live rock critters, easily visible scuttling across live rock, there are quite a few of them. My live rock Is extremely mature and teaming with life so I'm used to all the usual critters like flatworms bristleworms copepods amphipods I've seen em all.. all apart from these!! Any help would be much appreciated and thanks for the patience im a new member and this is my first post

 

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