Any tips on keeping 2 RES ?

I am doing my research because my neighbour knows im an aquarist he decided to give me his turtles to keep with everything because hes got a baby girl to look after but the tanks to small so im going to put them in my empty 75 gallon tank for NOW so any other tips ive already got 2 fx5 filters running on all my tanks so any tips on turtle care will help if your going to talk about the tank size dont comment please i have got a pond so during summer i might let em out so only turtle care tips i know a few basics but its best if someone gave me their exp. with em thanks!