I ran a successful BioCube tank for a while. The stock lighting isn't going to keep much besides softies and some simple LPS, maybe. Even then the colors won't be great. If you like the form factor of a BioCube, you can always upgrade the lighting. nanotuners offers a bunch of in-hood upgrades, but I'd imaging most of tehse (besides the LED ones) would result in the need for a chiller. Another option os to remove the hood and use another light. I have a Nove Extreme Pro on mine currently. Many people also change out the filtration on these tanks. I removed all the BioBalls and put an inTank media rack in mine. Nano-Reef.com has a lot of info on running nanos. Caesars has a nic BioCube as well, which currently has a Kessil light (LED) over it. It used to run stock lighting, and looked great then too.