New 29g BioCube

It seems u have fewer larger rocks rather then more smaller rocks, which is harder for aquascaping. I think you should avoid putting your rock towards the front of the tank and try to get it more in the back, so the fish dont hide behind the rocks all day so u cant see them, make your fish come out and dont let them hide behind the scene

I think it looks pretty good. I like the cave and it appears you will have plenty of room for coral.

I agree with itzclayyo, lay your rock backward , they must lean againts the back or you'll lose your fish in the back, not very intersting for a viewer. Good cave work though. Bring everthing in the back and you'll be fine. Make sure your rock work is stable, specially if you intent on having turbo snails and a urchin. They are buldozers and push on everything. Some putty will be needed to secure your rocks. Keep at it and keep us apprazed of your progress.

Your heater can go in the bottom of your second chamber, take off the piece of plastic grid out and place your heater at the bottom. Other tricks are at my thread for biocubes http://www.nano-reef.com/forums/index.php?showtopic=145325 specially concerning the use of your chambers, take a look.