do they need to be in a species only tank???? are they reef safe???? and how big will they get?

yes they do - will try to eat just about anything. They are reef safe since they won't eat corals, but will eat shrimp, crabs, and fish

and how big they get is dependent on what species it is... and it's still a bit early to say what it is.

oh man that guy is SO cool. keep us posted.

If you are talking about the ones that Seahorse Fanatic and Chin got at our store, then they are Sepia Bandiensis, or at least that is what the supplier says they are.
Alan