I will probably be getting either a 20 or 29 gallon tank soon. If I get the 20, it will be home to a pair of convicts, but if I I get the 29, it will probably be home to some swordtails, cories, and angels. If I get the 20, I will probably get the Aquaclear 50, but if I get the 29, I am not to sure which filter to get. I am thinking either the Emperor 280, Aquaclear 70 or two filters. My first question is will I have enough for the 20 and my second question is which filter should I get for the 29. Any suggestions would be appreciated.