Yes,theres only 2 Bakki Showers with 400kg of Momotaro's BacteriaHouse media,and no other filters used.The pond is about 60tons(15800gallons),the water is turned over 2times per hour.I used an UV for 2months at the beginning just to make sure that the water dont turn too green.But now its been 2 months that I have not used the UV.I also do a 5% water change every week.