I have a 800 gallon koi pond outside that has 10 top notch Koi from a local Koi fanatic. Well they started produce babies this year. There has been 2 spawns that I know of. I have only spotted 4 babies from the first spawn and they are about 2 inches long. Today I noticed 1 baby less than an inch long which tells me there might be more. My pond stays in full sunlight but is over half covered with lillies and hyacinth. The water is green because my UV burned out. My question which my sound silly but I have adopted 3 spotted pond frogs and as of yesterday a bull frog. Of course they love to show up on there own. I am worried they are eating all the babies especially the bull frog. How can you rid an outdoor pond of frogs short of diving in to catch them? Is their some secret additive you can add like gasoline to get rid of the frogs and not the koi? The gasoline was a joke by the way. Any info?