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The exact feeding requirements for turtles vary by species. But there are several important things you need to know about feeding any aquatic turtle. The first thing you need to understand is that aquatic turtles have to be in the water to eat because they need the water to wash down their food. Even if they take food from your hand, they'll still run or jump into the water to swallow it. Many keepers recommend feeding turtles in a separate tank from the one they live in. This is mainly to prevent leftovers, which can foul the tank. I usually don't do this with dry, floating foods because it's easy enough to scoop up the leftovers with a net. Also, sometimes I have fish in the tank and they scoop up the leftovers. But when I feed my turtles messy food that's hard to scoop up with a net, I feed them in a separate tank.
To learn more about a red slider's diet, check out this website!