I have been looking around at some used tanks in my area, and I have found one that looks pretty impressive.
It is a used, 30 Gallon tank (I know it is small, but I don't have a lot of space in my room) that comes with a heater, live plants, light, ornaments, gravel, suction cleaner and fish. It also comes with two filters - an undergravel filter, and a TetraTec PF 500. I Google'd that, and I saw that it looks like a pretty decent filter. I want to know whether it is a good or bad filter compared to others on the market.