I was under the impression that my RESs would eat the feeder fish I put in. However, I must have the craziest turtles in the world! I've got two red eared sliders. I had traveled out of town for a week back in July and bought a dozen feeder fish so that they would have food while I was gone. Anyway, long story short... once I returned home 5 of the fish were still alive (no big deal) but now...in December the 5 fish are still alive and living happily in the tank with two red ear sliders. To be honest, it kind of upsets me because now I have to buy food for these darn fish to

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About 2 months ago I had a 2nd tank that was truely a fish tank (Guromis, tetra, pleco etc.) I let that tank die out and the last fish living was the pleco. Seeing that the feeder fish had lived so happily with my RESs I decided to try the pleco in the tank to thinking he could help keep the tank clean. I'm happy to report that now all the creatures are living happily together in a 55 gallon long tank. 2 Red Eared Sliders, 5 Feeder fish and a Pleco.
I have to admit, I do enjoy the tank with all the friends and have been thinking about getting another baby RES from a friend and introducing him to the happy tank. (Of course I would get a larger tank for 3 turtles)
So, while I think it is extremely rare and may not be permanent...it is, in my opinion, possible for fish to co-exist with RESs.