im building an out of tank basking spot like this because red ear slider love as much water as possible and it keeps them from fighting with eachother cuz they have more swimming space so this way i can full the tank up and make a nice lookin thing like this( of course mine will look better then these tho)
http://i147.photobucket.com/albums/r319/mindyandzach/Picture013-1.jpg
http://i147.photobucket.com/albums/r319/mindyandzach/Picture013-1.jpg