...or do nothing? I have a 29 gallon tank and I have 2 oscars, a Midas, and a Jack Dempsey. My oscars are about seven inches long. My midas is about 7 inches long. My Jack Dempsey is about 4 inches long. I have a 10 gallon tank and its 20x 10x 12 feet long and my 29 gallon tank is 30x 12.25 feet...