<human>: (There are three images of the pond I put him in.)

Yesterday, my dad found a turtle in our pool. he promptly fished it out and put it in our small pond (see link for photos). I could not manage to get a photo of it, because it is hiding under a lily pad and I do not wish to disturb it. It has some dull yellow lines along the grooves of its shell and some reddish tinging on the edges. From my research, I am thinking it may be a painted turtle, though I am unsure. I will try to post a photo when it comes out of hiding. 

What I would like to know is whether or not my pond is a good environment for it. We have always had fish and two frogs have made it their home over the past few years. Predatory birds and other animals have never been a problem (I assume because the pond borders my house and is surrounded by tall objects). The water ranges from 6-8 inches to about 18 inches. As you can see from the photos, there is a surrounding "beach" composed of rocks that slop to the pond. There is always an abundance of small bugs and the plants that grow around the pond thrive.

My main question is whether or not I should leave the turtle in my pond. I want to ensure that it is safe and able to stay healthy. I live in a very suburban area so I worry about releasing him outright.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I found a turtle and put him in the pond I linked photos of. I think he's a painted turtle but I could be wrong and will post a photo soon. Is he in a good environment.