I went for a sump and lower fuge on mine. I just killed off my cheato a few weeks ago so waiting for what few strands are left to grow back. The only issues I see with a fuge in the rear are 1 it's not the easiest to get back there with the hood on and 2, the glass between the front and rear is just smoked glass so any powerful light will show through (with the DT lights off I can see the tiny LED from my Neotherm heater shining through, albeit barely). You would need to add probably black acrylic (like the IM tanks) to the dividing wall to keep light bleeding through.