Nice twist with the poster and (in tank) dollar $ sign. How about a City scape as the background? I see you're from Jersey... Never set foot. But I know you got some nice skylines there. You could even take your own pic and find a place online to make a vinyl wrap to Your tank's dimensions.
I'm thinking cinderblocks and ciclhids, and scavengers and crays, And Maybe you should culture your own Leaches for food. You my friend have attempted to represent Gangsterism via the MFk way. If you come off corny... I gotta kick you to the curb. But if you focus, and stay true to the theme... I'm a fan!