Sand flea?

[Feclar]

Well got a shipment of critters while i was out of the office, friend put them in my tank

This tank is cycling for a tiny mantis 1.5" peacock

They all got in fine, however one of them is a sand flea...


The flea is about 1.5", flys around when I first turn the lights on and then quickly burrows into the sand bed, likes to stick his feelers out from time to time

Is he any danger to my new peacock or a reef tank?

Looks almost identical to this...