VERY VERY COOL SETUP!!!!
I really like cubes as well, and you have done a great job on this one!!! I too will be watching this, as I think I might be headed this direction instead of a 75g upgrade to my 55g I have now!
You might want to try some craft mesh on the inside of the overflow to keep the shrimp out! Its cheap and pretty easy to work with!
congrats on the flower opening too!!!
Keep up the GREAT WORK!!!