Plan to have a 40 gallon tank with a razorback musk hatchling with a large firemouth cichlid and a few other fish (nothing larger than 3"). I know the turtle needs land and heat but do these turtles need UVA/UVB?
They do require UVA and some B lighting. I have a 55g with a juvie northern terrapin and a pair of Steindachneri Geo's. Watch the firemouth cant stress the lil guy out. Some FM's can be a bit tempermental. Check this site out.... http://www.theturtlesource.com/caresheet_mud_musk_turtle.asp
My firemouth isn't too aggressive. He's with some other central/south american cichlids and he's one of the underdogs, even though he had quite the temper some time back. He learned his leason after flaring his gills at my Vieja Maculicauda (Black belt cichlid) and got beat up badly haha.