Welcome to Aquaria Central! My favorite is the Tiger (red tiger/Randall's). Now by FOWLR, what kind of fish are you keeping? Be sure not to house with Triggers, Lions, Eels, Puffers, etc as it will be food. It is also really cool to get one of the Shrimp/Prawn Gobies and watch the symbiotic relationship they have. Anyway hope this helps and good luck!