Hey apw63... I have a Nuvo 38 and I did put in a whole sump with refugium, large Bubblemagnus skimmer, etc. After some time of experimenting with various chemistry theories, I am basically now running Zeolites on a 3 hour on/off cycle and a carbon reactor. (Hence the need for the sump!) The Zeolite system, in addition to the chaeto & other macro algae, allows me to have near perfect water chemistry despite relatively heavy feeding. I ended up trashing the matching cabinet opting instead to use a sturdy bath cabinet which I reinforced. I ended up adding almost 17 gallons of capacity with the sump. The only down side is that there is more noise due to the movement of water... the coral and fish seem happy tho' =D!