Hey everyone! So glad I discovered this place. My DH and I just spent all evening at two different pet stores. My DH is setting up an aquarium. We are newbies. We purchased a 55G tank, a heater, filter, and tops with lights. I think we got the wrong size filter. And, After searching Amazon am wondering if we got the wrong tank! Please help us. I am not sure about listening to the employees at pet store.