I just dug out our old fish tank that I am guessing is about 5 or eight gallons. It has a filter that is combined with a pump. The tank that is in use now is smaller. The problem is is that I don't know if I should use the filter/pump because it takes up room and I just purchased a Chinese algae eater and I didn't want it to starve. The tank in use now only has an air pump and a light. I can use the pump and light for the new tank. Please let me know what you think i should do.