This is our 20 gallon tank. It's been set up since Dec 97. Many of the pictures on this sight, besides the goldfish, are from this tank. It has an Aquaclear Mini, and a Powerhead 201 running an undergravel for filtration. It also has a Second Nature Challenger 75W heater. This is a community tank. It contains Mollies (Sailfin, Marble and Swordtail), a Rainbow Dannio, and two Cherry Barbs.