I don't have room in my skimmer section of the sump.  it is only 6" x 11".  That is why I went with the Mini G in the first place.  I had to position the octopus just right to get it to fit.  It is on a 20 high with a 20 high sump/fuge for a total volume of around 30 gallons, so I think it will be alright.  I keep light bioloads anyway.