Update
Turtles and fish are getting along OK. Antonia has shown no further inclination to go after a fish. So I suspect she went after one of the new and smaller corys simply because he/she was small and a newcomer to the tank. None of the turtles has shown any inclination to go after any of the fish since the single incident with Antonia. In fact, the corys seem to go about their activity with little concern about the turtles. The turtles for their part seem not to care much about the fish. Frequently the corys swim right in front of the turtles and the turtles ignore them. Even the goldens no longer swim for cover as soon as a turtle hits the water, but continue browsing unless a turtle swims near them. It appears that everyone is getting used to everyone else being around and predominantly non-threatening.
I'll keep updating from time to time because I think many members are interested in keeping fish with their RES. One thing I'm pretty sure about is that the fish require a secure area of the tank and lots of hiding places so that they have the chance to escape when/if a turtle decides the fish looks like a meal. I think not only does this provide security for the fish, but also I think that after going after a fish and discovering that it will *always* escape, the turtles figure out it's a waste of time and effort to try.

