Its only been added to the tank yesterday and I didn't see it eat yet, but I also fed live brine and frozen mysis then went for a bike ride. It didn't look great at first, very stressed, but I think its calmed now and will hopefully eat today.
Its 5-6" long total length, about the diameter of a pencil in the middle. Very very cool little beasty.
I'm hoping to have all the new arrivals switched from live foods to frozen mysis within the month. (thats the goal anyway)