i agree as well, if you have no source for ammonia then your test will not show any. Add 4-6 drops of that 100% ammonia per 10 gallons of tank water and then wait 24 hours and test it. If you then have no ammonia or nitrite but you have nitrate then you can add what ever fish you want. If you are going to wait on the fish then you need to add 2-3 drops of ammonia per day to feed the bacteria.