Do I need it to cycle a 55 gal tank with only 14 fry about 3/4" long? I just set it up yesterday and I don't have a sponge that I can take out from an existing tank. I am putting 7 white calvus and 7 electric yellow labs in the tank and I won't be adding anything. If I do need it how much should I buy? Where can I get some? Is there a place in MA or maybe an online store? How much does it cost? Thanks For all you help.