I don't, actually. I wouldn't even know how to get a shot that deep---there is NO light there. Basically, the lower intake grate is a "box". Imagine a box with the front, and top being a grate. I had to break the top grate off, as it was sealed on with silicone, in order to free a sucked in anemone that had no business being in my tank to start with (much too new of a tank, and I hadn't blocked the intakes where it could be sucked in, and hence, was). I stuck a powerhead sponge in the "box", and placed the broken grate back on top of it. The biocube has a carbon-floss filter cartridge that slides down behind the intake grates; I just took it out and put a 'fluval in-tank canister' sponge in place of it (it is bunched up at the bottom, b/c I didn't trim it first), and the heater sits in that chamber behind the sponge. The second chamber holds the bioballs, and I have replaced half of them so far with live rock rubble. I plan to fill the second chamber entirely with lr rubble, but am replacing it slowly to not lose so much beneficial bacteria at once. There are a few pics of my biocube on my public profile, but bear in mind that it is still a newish tank, and fairly plain ; )
~Sarah