It's been about 2 months since I started the cycling (I used Red Sea Reef Mature kit in a Max Nano Peninsula) and until a few days ago ammonia has always been at around 0.1 ppm. About a month ago I talked to my LFS about the ammonia levels (0.1 at the time) and we decided I could try adding two hermit crabs. They both were doing well so after two more weeks I introduced a yellow watchman goby and a pistol shrimp. They're also doing great. They're digging burrows and eating all the food I put in the tank. I've been feeding extremely carefully so when I checked ammonia levels and it showed 1.2 I was very confused because all animals are ok. What could be the cause of this and what should I do now? I did a 30% water change immediately after I tested the water. I've also been dosing nitrifying bacteria every week since the Reef Mature program ended.