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Hi
I've got 3 turtles, one big and the other two smaller than it. I've had the big one for about two years this June and the small ones for about a year. They've never showed aggression towards each other , but my big turtle recently recieved a skin injury on his back leg and it healed (mostly). But today I saw one of the smaller one going and biting the big one's injured leg and opening up the wound again. It's concerning me a lot and I would really appreciate any help. All three turtles are Red Eared Sliders.

Hi, aggression usually happens when one of them is a male. There really isn't much you can do but find a way to divide their tank, have separate tanks, or rehome one of them. It's just going to get worse as they get bigger and stronger.

His wound is healed now.and I think I'll keep him back with them......
Should I?

Up to you but it will happen again and again. It's a problem when they are captive and in a confined space.

If the wound was inflicted by the other turtles in the first place, I would not put them back together. However, sometimes, a turtle injures itself and other turtles will be tempted to pick at the wound but once it is healed there is no more agression… Maybe you are lucky.