As Ken suggested, buy the 2 at the same time. Study the tank to see which 2 seem to hang out together They love terra cotta pots to feel safe in. They like that hideaway kinda theme. Get a few decos like that as your shark will claim one also. Good Luck and get some pictures!!oh that's awesome. I saw some at the fish store and they were gorgeous.
Now to do more research on care and all that stuff before I move forward with the plan.
if you can give any advice I would love to hear it. of course I will reading everything in this section too