Stopped by the LFS today and picked up 5 ghost shrimp.  They were only a quarter a piece so I thought what the heck I'll see if they'll make it.  I have a 125 goldfish tank with two 15" koi awaiting their new pond in the spring.   I tossed 3 into the large tank and 2 into my 15 gallon quarantine tank. I have about 50lbs of slate in the tank with lots of hiding spots.  When I tossed them in on top of the slate I fed the fish.  The shrimp all sat there on the rocks for a few minutes and one found a hiding spot.  I came back about 5 minutes later and noticed my koi picking at the rocks where the other 2 were.  Now its  been about 9 hours and they are nowhere to be seen.  
So what do you think are they hiding or lunch?
				
			So what do you think are they hiding or lunch?