All great suggestions. I added an InTank media basket and underwater lights to make a fuge. Forget about using the stock filter cartridges. Run filter floss on top of the media basket (2nd chamber) and carbon and chaeto in the media basket.
Also cut out the notch to increase flow to...
Welcome.
Folks on this forum are very knowledgeable, but another great resource for BioCubes is:
http://www.nano-reef.com/forums/index.php?showtopic=180788&st=0&start=0
Check out Nano Reef. They have a lot of info on BioCubes and recommended mods:
http://www.nano-reef.com/forums/index.php?showtopic=180788&st=460&start=460
I would get rid of the filter supplied, remove all the bio balls and replace with a media basket and under water lights to give you a...