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Why does the pond turtles attack my pet turtle? - pet pond turtles

I live in an apartment and I have to leave soon, so I give my pet (Red Eared Slider) turtle must, I think somewhere in the release into the pond near my home, because many turtles and they are all RES. When I got my turtle in the pond to bite my neck and my turtle from others that I bring my pet from the pond immediately. I do not know why my pet turtle pond, but says the local pet store, it has to do with me cleaning the sludge layer of my tortoise with a brush.

I do not know whether or not it makes sense, but I beg needed a solution to prevent this.