Hi JAustin,
Nice looking tank. Corals are looking pretty happy as well. Funny enough I too downgraded from a 100 gallon to a bio-cube. Actually, I went down to a 6 gallon first then to the cube - lol. Rocks from previous tank went into my sons bio-cube and the then to my 6 gallon. Rest I boxed up and stored until I was able to pick back up and start over. I lost mine due to a power outage while on vacation and power never kicked back on.
Anyway a question if you don't mind? Did you actually drill the bio-cube and plumb down to the sump? If so, which chamber and was it dry or did you actually have water in the tank? This is actually something that I'm considering doing now but my cube is actually up and running now

Wish I would have done it first blast it all.
Also - how do you like the controller? I've been looking at that one plus the apex. I've owned their previous one, Neptune, but my German Shepherd Dog decided it was a chew toy and it is nothing but pieces

Not even sure how she managed to get it off the stand - go figure.
Both our cubes have been retrofitted with LED's. Mine is using the kit from Steve's which uses Luxeon ES series and my son's is using Rapid's which use Cree. Thus the controller question. I'm either going to go buy another one or just work off the simple DIY ones based off the typhoon / arduino builds. I think we'll get better performance when using the dimmer options via the PWM signals and I really miss the on/off pump controller while feeding.
Again, looks really nice. Thank you for sharing.