I think it depends on the bioload the turtles create. I used to have two red eared sliders in a 75 gallon, and they turned the water yellow every few days. 150 is a bit more space, are you able to keep the nitrates below 20ppm? If you don't have any problem with the nitrates, I'd say most mid-sized CA cichlids such as the texas in your picture would be candidates, though of course there is alaways the risk that the turtles will take a bite. But you could give it a shot if you were determined.