We have a waterfall and pond in our backyard stocked with goldfish and koi.  You will notice from the picture that they seem to be MIA.  They have a cave they can go into, but they have never all been in there for hours.  We called our local fish store, and they said we might have a predator and the fish are scared.  Poor fishies!!!  I couldn’t even lure them out with treats.  Any ideas?  We have lilies ordered, but they won’t be shipped until spring.