a 100 hundred should be fine for a few months, just remember that despite their small size, you should have limited decor, like maybe a small island of LR in the middle, so the shark can lap around the tank freely, or hide behind the island in the day, and they put out a good bit of waste. I have to say though, sharks are THE ULTIMATE! Good luck and post some pics of your setup and shark as soon as you get it up and running. Only see a few bamboos around this neck of the woods, and thats rare.