I am not sure about your tank design either, but I also have the Oceanic Nano Skimmer in my 29 Biocube and it works great. I have heard alot of bad things about that fission skimmer so beware of it, just what I hear no personal experience with it. The Sapphire Skimmer is a great skimmer also, it is alot bigger than the Oceanic and alot more money, in my area they run about 145, and the Oceanic skimmer was 32 and it does work great. Good Luck