I think the main consideration and what it all comes down to is if you are still using the stock top of the biocube. If you are then go Sapphire said:I was able to get the stock top on with the Tunze...
really? did you cut of the back lip for it to fit? did you have to break out the bottom of chamber 2? said:The back lip was cut back a bit and I did remove the bottom of chamber 2. Now that I am running the tank topless with a MH pendant over it I put the bottom back in chamber 2. It goes in and out easily. There are quite a few references to the modification over on nano-reef.com.