Hey just tested levels in the tank, PH=Fine, Nitrites=Fine, Nitrates=Fine, Ammonia=0.8 what could I do I have 1 Damsel, 15lbs of live ock, 20lbs of live sand, filter, powerhead, and 15watt light for a 20gallon tank. Please help me I know the ammonia levels are low. I wanted to know what to do to...