WAIT!!! In order to keep mandarins you need to have a place for the pods to reproduce away from predators (refugium). If you put a mandarin in a 75 fully stocked with pods, it will eat all of the pods and eventually starve to death. These fish are very delicate and aggressive eaters/hunters.
I have seen pods for sale or you can get them from somebody in the hobby who has cheato or caulerpa, etc...They come with the algae...
Or checkout Saltwater City or Keen Reef, they carry Tiger Pods. I know Sal has them, but it's a drive for you. If you decide to come up this way drop me a pm and stop by my house...I have a 120 reef with the proper set up for mandarins. I'll even give you some caulerpa with extra pods to take home for stopping by.
How long has your tank been set up? What other fish are in it? Is there a sump or fuge?