After a heron ate all my koi I thought my pond was empty of fish. But then, a year later, I discovered two sunfish I had put in there as minnows, but had long ago lost track of. Then I found a baby sunfish in my filter. Now the fish have mated again and are guarding the eggs. The problem is there's a bull frog out there that has apparently eaten all the previous fry. I've displaced several frogs in the past but this one spends most of the time under water. On the rare occasions when I have seen him, he's seen me first - and he's gone. I'm wondering what I might do to help the new crop of sunfish along until I can find a way of getting that frog. Any suggestions regarding any aspect of the problem are much appreciated. Thank you.