First fishless cycle. (5.5 gallons and using extra tank media and ammonia.) This is my second week. According to the instructions I've been following, I only need to test the ammonia and once it starts dropping, I can start testing other parameters. Two days ago the ammonia was between 4-8. I tested it now and to me it looked 0.0, so I tested the rest and these were my readings. I'm a little unclear as to what I do next. Do I need to add more ammonia to get it back up, and then wait til it goes back down to 0?