Give your turtle %50 of its diet turlte food and the other %50 should be natural things it finds in the wild. Such as: Crayfish, minnows, bugs, worms, crustaeseans. Your water should not be to high, but it depends on the size of your turtle. You should tell us that. Since its a 20 long, you can keep it in their until its 3 inches long. These turtles can get 8-12 inches long so be prepaired to provided it a pond once adult. THis animal needs a haul out area(dry "land") you can use a brick and their are products on the market for that aswell. Above the land area, a Mercury Vapor bulb MUST be provided. THis is pretty much it. Please ask questions if you have any.