do you have testing kits? depending on where you live i know congressional aquarium in rockville will test your water for free. When i cycled my tank i did it with rocks and sand in it, i also bought two damsel fish, because they are hardy and cheap fish. since you used tap water you probably have chlorine there, not sure if you have anything that get's rid of chlorine? comes handy sometimes. Then i just waited about 2 months and let it cycle. Their are these fast cycle products out there, not sure how good they are or if they even do anything. But i've never used it. Also one thing i didn't have is patience. So i recommend patience with saltwater :o)