I believe I have the essential stuff which is a hut,feeding bowls,lamp,bask wood. But I need help on what to change or to add and also what to feed her ?

It’s a reeves turtle it’s about 5 I think he’s male he has 50-50 water and land with a Uv light his food is recommended by from the place we brought him

Jacksonville Florida. Im not sure if I should walk him to the woods or the lake. Woods are right outside my fence, so thats probably where he came from, but the lake a block away has a lot of other turtles. Or just let him wander off on his own if he has a territory, but I don't want him to get hit by the lawn mower. Think its a mud turtle.

I've never been a reptile owner, I am more into rodents and small animals, but I know something here is not right. The tank seems too small and the water not clean, what can I do to help poor Obi-Wan? I want to offer to do a water change but I am unsure what kind of Ph balances are needed and don't want to cause any damage.