I am getting a 180g, or I will build a larger one (not sure, since I dont want a 240g tank to be my first DIY tank). I will probably buy the used 180g. Plus, my LFS sells eggs and sharks. So I can buy one from there. Why do you say to keep it by its self? WIll fish pick at it? Right now, all I have is a Blue Tang, 2 Percula Clowns, and a Yellow Watchmen Goby.