hey so i saw an ad on craigslist for a RES with a tank, a canister filter, a container of food, a basking dock, and the lights for $100. i am very interested and know how to take care of them to a extent. i know water temperature, lighting, and size, but i need some more tips about there care in general. like maintaining the filter, i have to change something monthly right? and water changes and cleaning. i also need some help on food. what should i be feeding an adult? any help would be great!