red eared sliders are pretty tough and can withstand a lot of 'less then optimum' care. Which is one of the reasons that many states (my own included) are trying to list them as an invasive species. Space is probably the primary concern. Forget about aquariums and get a cattle trough. One of those 100+ gallon plastic ones at fleet farm or Tractor Supply work really well (and is a lot cheaper then a glass aquarium) A basking lamp and a log or rock to haul out on is very much appreciated, but you don't really need a water heater if it's going to be inside. Some people use the biggest filters they can find, I think filtering a turtle tank is an exercise in futility and I do complete water changes regularily (a nearby floor drain and a syphon hose come in handy). I feed trout pellets as a main source of food but will throw in a few minnows or fish heads on occasion. It's not pretty, but it works for me.