Big reef little predator or big predator little reef ????? Need some ideas!!!!

[reefwars]

hey all i need some advice or for someone to brainstorm on what im gonna put in my tank lol so heres the layout the tank is as you all know 4x4x20" .....it has a section dived off at 36lx24wx20" origional plan was to house my snowflake eel.i believe its just about 75 gallons.

so all in all i have a " L " that is 130 gallons and a box that is 75 gallons

i was thinking possibly aggressive tank or non reefsafe in the 130 and do a mini reef in the 75 or i could do it vice versa have a small predator section and large reef any thoughts???