I have 3 shubunkin & 2 goldfish in a large garden pond. I bought the fish at the same time in Aptil of this year & all the fish are only about 3 to 4 inches long. One of the goldfish is being constantly chased to exhaustion where it was nearly floating on top of the pond so I removed it 3 days ago. It has been fine on its own but I have just tried to put it back in the pond & the same problem is ocurring. Can anyone provide any advice.