Hay Dick, If it weren't for the guys like you on board I would have killed all my koi this past summer.
I had pea gravel in the bottom of my pond that caused the problem and I thought I was getting it clean and I wasn't, over time a aeromonas bacteria set up and all my koi developed ulcers, took me two hole days to get that gravel out and I have not had a problem since. Now when I clean the pond its clean and the water stay good and clear.
I have learned a bunch since coming to this board and I visit other boards but none can compare to the members here. This board has been refered to as the Pro's Board and they are right!!!
To any new ponders I strongly suggest that you learn about what quality FIRST as this is what it takes to grow and keep beautiful koi. And never put gravel in a pond, you WILL BE SORRY.
Judy