I have a 20 gallon long FOWLR tank, with one blue damsel, 2 pajama cardinals, a hawaiian feather duster, and two blue legged hermit crabs. There is about 18 lbs of live rock. Well, I tested my water earlier, and:
Ammonia: 0
Nitrite: 0
Nitrate: 0
I am using a API master saltwater test kit.
The...