Thanks for the reply guys-I will start at 12inches, and work my way down to be on the safe side.
db366-I saw the thread with the picture of your biocube in the member tank forum. Looks great! It's exactly how my setup is anticipating to look right now. Can you let me know where to get the material/how you set up the mesh on top so that the fish don't jump out? I have to ditch my cover as well with the new LED light coming in...