This will be my 2nd summer as a pond owner. Pond is 1/4 ac with 137 CC and 50-60 hybrid bream...also have FHM and one pretty good size gold fish. We've had it all...DW... FA.... primrose... so far we've overcome. Now I've started wondering about fish health. What are some of the problems I should watch for this year? And - how likely is it that you would run into 'health' problems?