first off, how big are the turtles and do you know what kind they are? Also, do you know what kind of fish are in the tank? I can tell you now that the turtles will eat the fish. they will also need a much larger tank as they get larger.
for the native fish. I don't see why not. at the moment i have a tank with native spieces of fish in it and they are doing awsome. the hardest part about native fish would be gettiong them to eat the foods that you will be feeding them. befor you get the fish do a google on them to find out how big they get when full grown and more importantly, what they eat. when you know what they eat, try to copy their diet. once you have them eating, you can try getting them to eat regular fish food. i have found that the best way to do this is to have other fish in the tank that already eat regular food (ie. one or two small feeder goldfish) and then the wild fish can learn from example. i have a bass in my tank that is about three inches long and he eats fish flakes and freeze dried shrimp(turtle food for the turtle that lives with him) among other things. i have also found that all wild fish love live black worms. they also like guppy fry if they are big enough to eat them.
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