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First, the unsupervised two year old was a visiting relative who thankfully is no longer visiting. And yes, scary that he was not watched. Secondly, the herons arent going missing..our goldfish have suddenly went missing due to the herons eating them or they have what looks like a saddle wound where the beak grabbed them but got away. I put up several chimes and thus far this year no herons. This situation with the dead fish just started a week ago but were down six fish. I dont want to kill the frog but it seems obvious its got to be relocated. And..I'm not confused. I'm ticked off my 12 yr old fish were killed and now my new fish are being killed. Thanks to all the positive answers :) I'm in the eastern US.