For Christmas, my son received a 5 gallon Eclipse Hex 5 tank. This is our first tank, and the tank has been running / occupied for 3 weeks. We have 2 male Mollies in it, one gold and one black. The current levels are Ammonia .25; Nitrite .5; and Nitrate 10. However, about 5-6 days ago (which is the first time I tested the water), the Nitrite and Nitrate levels were off the chart. I started doing daily 20% water changes (being careful with the temperature), and finally on Saturday the levels dropped to the current levels, probably due to Amquel - before that I had been using Aquasafe. I also started adding some salt a few days ago. I have 3 questions for you all. 1. With the levels mentioned above, do I need to do more water changes, or should I leave it be for a while? 2. I would like to add just a couple more fish. Should I add a bottom feeder, like a Cory catfish? or should I add one more gold and one more black Molly to be a companion for the others? Enough room for all 5? 3. The gold molly seems to bottom-sit sometime. The black one doesn't. Is this normal behavior, or is it due to the conditions over the past couple weeks. Thanks for your help.