Pretty nice little setup, keep in mind turtles don't really like friends and need a lot of space when full grown, I think red ears are recommend for a 125 gallon minimum each when grown, I was given four baby map turtles and had to get rid of them as there was no way I could make room for one, let alone four. They were super cute though, pretty shy, I had my 3 year old nephew catching bugs and worms for them as part of their diet. Also keep an eye on water quality, I couldn't believe how filthy four tiny turtles could be! I ended up spending a couple hundred on them and I only kept them for a month, heat lights, food, uvb, ramps and docks, etc. Almost worse than saltwater.
You should take a pic of the map turtles belly, I loved the designs on mine. Also how much did that tub cost you? I've been thinking about a little pond setup.
