Hi everyone. I am new here. Lately my koi have been jumping out of the pond. About 2 weeks ago my favorite one jumped out and I didnt find it in time. Then last week another one jumped out. We were able to get him back in and he is still alive but hasnt been as active. Then 3 days ago another one jumped out. We got him back in but sadly yesterday he died. I dont know what it is they never did this before. They were just starting to get active as it is warming up here in NJ. They are in a 1200 gallon pond. Some of the other koi and goldfish havnt jumped out and neither the sunfish and minnows we have in there also(knock on wood).Is there anything you think that can be making the fish do this? Do you think I should add any treatments to the water?