I found this water tank and decided to put it to use in my basement, as you can see. I read a lot on this site before I set this up and to what I read, works perfectly. I have a 6" pvc pipe in the tank filled with lava rock for the biological filtration, the pump sits in the top of the pipe, sucks the water from the bottom of the tank, through the lava rock, through the pump, to a 3 gallon bucket hanging over the tank. In the bucket I have 3" of carbon, some bio sponge filter. The bottom of the bucket has a ton of holes for the water to dispel out creating the aeration needed.