So 2 weeks ago I started my 69 gallon tank with dry Marco rock, live sand, Dr Tims One and Only, and a cocktail shrimp. After 3 days I began testing and I seen no real rise in ammonia and a very small rise in nitrite. At the 1 week mark I pulled out the shrimp and replaced it with a raw shrimp thinking maybe that was the problem. 1 week later I still see no rise in ammonia. Any reason for this? Or any ideas?