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.