| unless you're concerned about aggression from either one (i'm not very knowledgeable about paradise fish or RTS) and want to add in the less aggressive of the two to try to cut down on it, then i'd probably add them both so that you can make sure that the tank is used to the bio load of both of them. as long as you've inspected him to make sure that he's healthy, you should probably be okay
EDIT: as per amanda's post i'd wait to ad the TSS for a few more days, and put the paradise fish in first and let him stay in there while the TSS goes to work, after a week or two, then add the RTS |